I had the same problem! I had one family made up of a guy who definitely wanted kids, and a wife who thought it 'might be nice'. They didn't have kids. I waited until they were in their mid 40's before starting over.

When i started over, i got two 'not really' people, and they also refused to have children. Again, I played for while before giving up and starting over.

My third attempt was good, I got one child out of a 'definitely' girl and a 'maybe' guy but that was it. no more.

Now on my fourth attempt. have a definitely guy and had to wait two game years to get a definitely girl but she arrived and now they are at it like rabbits. 3 biological kids and 1 adopted. And their youngest is 2. No more 'It's too soon to have a baby' and no more arguing over not having children.

My advice? Scrap your game and start over. Wait an eternity but get the right people together! This game is a lot like living here in Australia - you only get ahead if you churn out lots of kids.