Board Thread:Speculation House/@comment-173.200.7.205-20151206214731/@comment-26872876-20151212203854

Phantomlink959 wrote: No.

Genes have an effect but do not cause the exact semblance.

The soul is not inherited, but moulded by your experiences. The starting point  may be within the same category as your parents but except in rare cases it would not be identical, even from birth it would be distinctive.

^^^ This.

The person's soul (personality, attitude, being) define the semblance. Part of that semblance is inspired from one's parents, but ultimately will take on unique properties based on the individual. Except in cases like Winter and Weiss where they apparently get Glyphs and Summoning... <.<