You provided a house yeah?, hello?! wakey wakey! It is your obligation Mister, not just a responsibility to your family (ex ey? and kids!) soooooo please don't be too proud trying to brag and nag that thing to us only to excuse or justify yourself from not taking the whole responsibility to your kids! They are yours from the day they were conceived, and based on what you said, you have tucked away some money for their university fees when they get older, you are actually only taking one point of the responsibility of a father to a child. I'll take that you have no plans neither to bring them here in the UK or Europe, wherever.. as you only want to start supporting them when they reach the age of 18
To be fair..You are making assumptions without knowing the full details..

He did say that his wife cheated on him and moved her BF into his family house..

That in itself is a tough situation as there is a very good chance that any child support sent by him would go towards the BF`s Tanduay fund (and others)..

Who`s to say that the kids are his at all?? It might be that his wife was cheating on him from day one or even before??? Who knows?

Unless this guy is prepared to tell all then I`m staying well out of it..

It's none of my business..