SimpleRelationship s1 = chain.get(i);
SimpleRelationship s2 = chain.get(i + 1);
if (s1.name == rel1 && s2.name == rel2 && s1.individual2 == s2.individual1) {
// Get the reverse relationship
RelationshipName rr = getReverseRelationship(newRel, s1.individual1.sex);
if (rr != null) {
// Only collapse if we actually could derive a reverse
// relationship
s1.individual2 = s2.individual2;
s1.name = newRel;