diff --git a/source/board/hani_iot.c b/source/board/hani_iot.c
index 83bfe5132..d353d18a3 100644
--- a/source/board/hani_iot.c
+++ b/source/board/hani_iot.c
@@ -25,7 +25,7 @@
 const board_info_t g_board_info = {
     .info_version = kBoardInfoVersion,
     .board_id = "0360",
-    .family_id = VENDOR_TO_FAMILY(kNXP_VendorID, 0), //ID not maching the predefined family ids
+    .family_id = kNXP_LPC55xx_FamilyID, //ID not maching the predefined family ids
     .flags = kEnablePageErase,
     .daplink_url_name =       "PRODINFOHTM",
     .daplink_drive_name =       "HANI_IOT",
diff --git a/source/board/lpc55S69xpresso.c b/source/board/lpc55S69xpresso.c
index b9a589064..a743721e6 100644
--- a/source/board/lpc55S69xpresso.c
+++ b/source/board/lpc55S69xpresso.c
@@ -25,7 +25,7 @@
 const board_info_t g_board_info = {
     .info_version = kBoardInfoVersion,
     .board_id = "0236",
-    .family_id = VENDOR_TO_FAMILY(kNXP_VendorID, 0), //ID not maching the predefined family ids
+    .family_id = kNXP_LPC55xx_FamilyID,
     .flags = kEnablePageErase,
     .daplink_url_name =       "PRODINFOHTM",
     .daplink_drive_name =       "LPC55S69",
diff --git a/source/family/nxp/lpc55S6X/target_reset.c b/source/family/nxp/lpc55S6X/target_reset.c
index fe0ebe94e..fb77aa1a5 100644
--- a/source/family/nxp/lpc55S6X/target_reset.c
+++ b/source/family/nxp/lpc55S6X/target_reset.c
@@ -106,7 +106,7 @@ static uint8_t lpc55s6x_target_set_state(target_state_t state)
 }
 
 const target_family_descriptor_t g_target_family_lpc55S6X = {
-    .family_id = VENDOR_TO_FAMILY(kNXP_VendorID, 0), //ID not maching the predefined family ids
+    .family_id = kNXP_LPC55xx_FamilyID, //ID not maching the predefined family ids
     .target_set_state = lpc55s6x_target_set_state,
 };
 
diff --git a/source/target/target_family.c b/source/target/target_family.c
index 1e8096cdb..a9d9ba372 100644
--- a/source/target/target_family.c
+++ b/source/target/target_family.c
@@ -43,35 +43,34 @@ const target_family_descriptor_t g_sw_sysresetreq_family = {
     .soft_reset_type = SYSRESETREQ,
 };
 
-//Weakly define family
-__attribute__((weak))
-const target_family_descriptor_t g_nxp_kinetis_kseries = {0};
-__attribute__((weak))
-const target_family_descriptor_t g_nxp_kinetis_lseries = {0};
-__attribute__((weak))
-const target_family_descriptor_t g_nxp_kinetis_k32w_series = {0};
-__attribute__((weak))
-const target_family_descriptor_t g_nxp_mimxrt = {0};
-__attribute__((weak))
-const target_family_descriptor_t g_nxp_rapid_iot = {0};
-__attribute__((weak))
-const target_family_descriptor_t  g_nordic_nrf51  = {0};
-__attribute__((weak))
-const target_family_descriptor_t  g_nordic_nrf52  = {0};
-__attribute__((weak))
-const target_family_descriptor_t g_realtek_rtl8195am  = {0};
-__attribute__((weak))
-const target_family_descriptor_t g_ti_family  = {0};
-__attribute__((weak))
-const target_family_descriptor_t g_wiznet_family  = {0};
-__attribute__((weak))
-const target_family_descriptor_t g_renesas_family  = {0};
-__attribute__((weak))
-const target_family_descriptor_t g_toshiba_tz_family  = {0};
-__attribute__((weak))
-const target_family_descriptor_t g_ambiq_ama3b1kk  = {0};
+// Weak references to family definitions.
+extern __WEAK const target_family_descriptor_t g_nxp_kinetis_kseries;
+extern __WEAK const target_family_descriptor_t g_nxp_kinetis_lseries;
+extern __WEAK const target_family_descriptor_t g_nxp_kinetis_k32w_series;
+extern __WEAK const target_family_descriptor_t g_nxp_mimxrt;
+extern __WEAK const target_family_descriptor_t g_nxp_rapid_iot;
+extern __WEAK const target_family_descriptor_t g_nxp_lpc55xx_series;
+extern __WEAK const target_family_descriptor_t g_nordic_nrf51;
+extern __WEAK const target_family_descriptor_t g_nordic_nrf52;
+extern __WEAK const target_family_descriptor_t g_realtek_rtl8195am;
+extern __WEAK const target_family_descriptor_t g_ti_family;
+extern __WEAK const target_family_descriptor_t g_wiznet_family;
+extern __WEAK const target_family_descriptor_t g_renesas_family;
+extern __WEAK const target_family_descriptor_t g_toshiba_tz_family;
+extern __WEAK const target_family_descriptor_t g_ambiq_ama3b1kk;
 
+//! @brief Terminator value for g_families list.
+//!
+//! This terminator value is chosen so that weak references to the family descriptors that
+//! resolve to NULL at link time do not terminate the list early.
+#define FAMILY_LIST_TERMINATOR ((const target_family_descriptor_t *)(0xffffffff))
 
+//! @brief Default list of family descriptors.
+//!
+//! init_family() scans this list searching for a family descriptor with an ID that matches
+//! the family ID set in the board info or target config structs. Because each of the family
+//! descriptors has a weak reference defined above, the entry in this list for a family whose
+//! descriptor is not included in the link will resolve to NULL and init_family() can skip it.
 __attribute__((weak))
 const target_family_descriptor_t *g_families[] = {
     &g_hw_reset_family,
@@ -80,6 +79,7 @@ const target_family_descriptor_t *g_families[] = {
     &g_nxp_kinetis_kseries,
     &g_nxp_kinetis_lseries,
     &g_nxp_kinetis_k32w_series,
+    &g_nxp_lpc55xx_series,
     &g_nxp_mimxrt,
     &g_nxp_rapid_iot,
     &g_nordic_nrf51,
@@ -90,7 +90,7 @@ const target_family_descriptor_t *g_families[] = {
     &g_renesas_family,
     &g_toshiba_tz_family,
     &g_ambiq_ama3b1kk,
-    0 // list terminator
+    FAMILY_LIST_TERMINATOR // list terminator
 };
 
 __attribute__((weak))
@@ -99,21 +99,25 @@ const target_family_descriptor_t *g_target_family = NULL;
 
 void init_family(void)
 {
-    uint8_t index = 0;
-    uint16_t family_id = get_family_id();
-    if (g_target_family != NULL){ //already set
+    // Check if the family is already set.
+    if (g_target_family != NULL) {
         return;
     }
 
-    while (g_families[index]!=0) {
-        if (g_families[index]->family_id && (g_families[index]->family_id == family_id)) {
+    // Scan families table looking for matching family ID.
+    uint8_t index = 0;
+    uint16_t family_id = get_family_id();
+
+    while (g_families[index] != FAMILY_LIST_TERMINATOR) {
+        if ((g_families[index] != NULL) && (g_families[index]->family_id == family_id)) {
             g_target_family = g_families[index];
             break;
         }
         index++;
     }
 
-    if(g_target_family == NULL){ //default family
+    // Last resort is to use a default family.
+    if (g_target_family == NULL) {
         g_target_family = &g_hw_reset_family;
     }
 }
@@ -137,11 +141,11 @@ uint8_t target_set_state(target_state_t state)
                     swd_set_soft_reset(g_target_family->soft_reset_type);
                 }
                 return swd_set_target_state_sw(state);
-            }else {
+            } else {
                 return 1;
             }
         }
-    }else{
+    } else {
         return 0;
     }
 }
@@ -150,7 +154,7 @@ void swd_set_target_reset(uint8_t asserted)
 {
     if (g_target_family && g_target_family->swd_set_target_reset) {
         g_target_family->swd_set_target_reset(asserted);
-    }else {
+    } else {
         (asserted) ? PIN_nRESET_OUT(0) : PIN_nRESET_OUT(1);
     }
 }
diff --git a/source/target/target_family.h b/source/target/target_family.h
index 80b47b265..c780c63a2 100644
--- a/source/target/target_family.h
+++ b/source/target/target_family.h
@@ -96,6 +96,7 @@ typedef enum _family_id {
     kNXP_Mimxrt_FamilyID = VENDOR_TO_FAMILY(kNXP_VendorID, 3),
     kNXP_RapidIot_FamilyID = VENDOR_TO_FAMILY(kNXP_VendorID, 4),
     kNXP_KinetisK32W_FamilyID = VENDOR_TO_FAMILY(kNXP_VendorID, 5),
+    kNXP_LPC55xx_FamilyID = VENDOR_TO_FAMILY(kNXP_VendorID, 6),
     kNordic_Nrf51_FamilyID = VENDOR_TO_FAMILY(kNordic_VendorID, 1),
     kNordic_Nrf52_FamilyID = VENDOR_TO_FAMILY(kNordic_VendorID, 2),
     kRealtek_Rtl8195am_FamilyID = VENDOR_TO_FAMILY(kRealtek_VendorID, 1),