The whole attitude with the girls have to change first. Educate then and appreciate them so they don't end up with losers.
Okay...... here is a hint.......<br />
Your sister's marriage isn't your business. It's hers. You cannot tell her to get over him. If she wants to get a divorce, she will do it on her own time.<br />
Stop giving him money. God only knows why you gave them money for their wedding - that's just silly. The fact YOU had to pay for HIS wedding should've been a hint in the first place.