Dh's marriage ended because exW had affair and refused to end it (dsc don't know). Dh gave her the house because she said the children would be happier at home. The week after, she put it on market. Dh paid twice what court order said just to keep her on board. But her new dh is not successful. The children are now adults and payments to their mother has stopped but he pays the 'children' directly however much they need without question.
gosh Hormonal that was EXACTLY the dynamic I had with my former DP 
It was like "why does laptop have the option to go travelling when she wants, flexible work she enjoys, days off drinking coffee and seeing culture etc when mum is working 70 hours a week in a high pressured job she hates because her new husband isn't as successful as she wants
and because she is blonde and photogenic she "deserves better than laptop"".
Mum had a new child with her new husband, and they feel he should go to private school - so that's another X years of paying for it.
I chose not to have a child and live like a hippy so don't have high costs
but the dynamic was "that bitch laptop gets everything her own way, why isn't she working as hard as mum?".
So although former DP (who was left penniless after divorce - way before my time - but made it through, got a nice new house and cleared mortgage, good pension etc) and I could both have been in a great position to go travelling, explore the world together, the cards were on that the stepdaughters would have ruined it on behalf of their mum.
(Every night out or cheap weekend away - which my former DP would be enthusiastically suggesting at the start - ended with one of the adult daughters having a tantrum and bombarding him with phone calls and often turning up at his flat like Little Orphan Annie trying to guilt him into coming home early).