The parents arent really the ones to interact with the kids, it's really just the kids and kids. If one of the parents definatly wanted children, I have found theres a better chance they will interact. If your person is 46, its hard to have kids. Heres a trick I use:
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When they argue about having the baby or they wont try, each time, you use the red glove, when their trying to make children, use the green glove. Sometimes that gives you twins, tripletts or sixtuplets!

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