[ARCHIVED] Can't set two mothers/fathers as parents in CAS

So I decided to do some tests on this (since I had mods turned off anyway testing a different problem I had) and I can only recreate this when an unmarried Sim adopts, regardless of gender. Steps I took to test:

1. Create household with two male Sims, set them as married, give them children in the following ways:

    a. Create another random Sim in the household, make them a child, assign their relationship to both adults in the household as father.

         *Success, both are now father.

    b. Play with genetics, using both adult male Sims

          *Success, by default both are father.

    c. Place in household, have one go to computer and adopt.

          *Success, by default both are father.

2. Create household with two female Sims, leave them unmarried to see if it makes a difference, give them children in the following ways:

    a. Create another random Sim in the household, make them a child, assign their relationship to both adults in the household as mother.

          *Success, both are now mother.

    b. Play with genetics, using both adult female Sims

          *Success, by default both are mother.

    c. Place in household, have one go to computer and adopt.

          *Failure: Child belongs only to Sim who adopted

3. Create household with two adult Sims, one male and one female, give them children in the following ways:

    a. Create another random Sim in the household, make them a child, assign their relationship to both adults in the household as mother/father.

          *Success, both are now parents.

    b. Play with genetics, using both adult Sims

          *Success, by default both are parents.

    c. Place in household, have one go to computer and adopt.

          *Failure: Child belongs only to Sim who adopted