add clarification on relationship rules

Author: vaeng

exercises/relative-distance/canonical-data.json

@@ -189,7 +189,7 @@
     },
     {
       "uuid": "46c9fbcb-e464-455f-a718-049ea3c7400a",
-      "description": "Complex graph, some shortcuts, cross-down and cross-up, cousins several times removed, with unrealted family tree",
+      "description": "Complex graph, some shortcuts, cross-down and cross-up, cousins several times removed, with unrelated family tree",
       "property": "degreeOfSeparation",
       "input": {
         "familyTree": {

exercises/relative-distance/instructions.md

@@ -31,4 +31,10 @@ The degree of separation between Tariq and Uma is 3 (Tariq → Helena → Isla 
 There's no known relationship between Isla and [Kevin][six-bacons], as there is no connection in the given data.
 The degree of separation between Uma and Isla is 1.
 
+~~~~exercism/note
+Isla and Tariq are siblings and have a separation of 1.
+For a genetic relationship analysis, you wouldn't be related to the person that married the brother of your father.
+This implementation would report a relationship distance of 2 from you to that person.
+~~~~
+
 [six-bacons]: https://en.m.wikipedia.org/wiki/Six_Degrees_of_Kevin_Bacon