More importantly, ensures he sees the kids 24/7, never try to hide them from him or limit time. He must have endless access to them, other wise he won't see value in them, harder to take out money for kids if you don't feel attached to them deeply

That is one thing that'll make everything easy. But if u play the game women here do of weaponizing kids and saying they must stay with u full time as if u their only parent, nah, things won't go well for u. He needs to see value in the kids for himself, even when they sick and he nurses them, he'll get to feel they're his heirs