So she feel guilty that they have no dad. Hard for their mom to say no.So they used emotional blackmail. Common thing.
Their parents are old now and the kids seem to blame them for the breakup of the past.If they are adults now, they do not need to ask for anything material.
You say one is educated?But not educated in manners and respect.People find out your personality is spoilt in the workplace, if they will not do the work they are asked to do because they don't feel like it. Sheesh. I say take all the stuff in their houses away that their dad bought.I am sure they would have nothing.