ok one, why do we have 2 topics on the same subject
2 like said there, here, regardless of your personal preferences, is reality in a nutshell
they had a story to write, and it has a interesting event* happen in a point in time.
you don't really know what goes on before it. you have to make THAT part of your story, and you get to do it yourself.
you don't know if this was 2 friends, one if not both gay/lisbian , who decided to have a kid or two and then call it a Divorce,
or Bisixual friends with Benefits,
Or a person who wanted to be single and be a parent after the divorce.
Or it could be brother and sister and Sis was pregnant for (fill in the blank) reasons
Or his actual dad/mom abandoned him and his wife/husband (your sister/brother)(or vice versa)
or one of you got stuck with the baby for (fill in the bank) reasons, (heck some people I know leave there kids to there Brother/sister in the case of death of both parents,)
for all we know you really are just brother and sister or a guy and his Female friend raising his/her Brother's/sister's kid because the wife died in childbirth and the kids heartbroken dad decided to Join her.
In the end, It does not really matter,
What we have is a person who is being the kids mom/dad for whatever reason, and another person whose also being the kids dad/mom for whatever reason, and they happen to have a House and a Car and a Brand new housekeeping robot....
Its your head cannon, your story, pick up the ball from that point in time and run with it, and stop complaining that you cant RP your story your way and make it yours.
Given that it was set in bascialy 1950s Americana from hell. . . My own personal story will probably be that the kid is my (now dead) Brothers Via insemination, he managed to survive the war but died due to long term radiation(he had made the deposit prior to the end of the war or watever) and I took them in because hey the kids Blood and mom because hey shes family too ya know.
*Seriously WWIII is not something that can be considered boring while you are in the middle of it