Let me see if I understand.
I create a YA Sim, place them, go into Manage Worlds, Select household A, then delete my created sim. And I'm now playing household A, household A has a baby, I then go to household B through manage worlds, household B has a baby, I decide I want a second baby in that household, so the parents raise parenting skill and become good friends with existing baby, and they adopt. Following adoption, I move to household C through manage worlds which has three YA+ people in it, I move out one of them to another house, and do my best for triplets in this house. I don't want to have to worry about the best friending/parenting thing with three anklebiters, so immediately move to household D through manage worlds. Household D has a couple who aren't lovebirds yet, so I have to get them to lovebirds before they can try for baby/adopt. I decide to adopt instead of try for baby and go on to house E through manage world, which only has one sim in it, I need to have someone else in the house with them, have them become lovebirds and try for baby/adopt. Now, I can't return to households A, B, C or D at this point, as they've already been played. Am I right in the wall of text I've just typed?