Q When a son divorces, should his family stay in contact with ex-wife? The son has a new lady in his life, and almost every member of the family is keeping in contact with his ex. They lend her money and baby-sit their children, plus children that are hers and not the son's. It just seems like too much and makes things very difficult. What's good ex-etiquette?
A Reading between the lines I suspect you are the "new lady," and it sounds like you don't like your boyfriend's family staying in touch with his ex. This is understandable because you probably want to build your own relationship with them, and it could feel like their involvement with her gets in the way. There also may be the fear that they will always prefer her.
That may be true, but good ex-etiquette dictates that you stop comparing and work on your own relationship with them. They are doing the right thing by staying in touch with her. She is not just the ex of their son or brother, but also the mother of their grandchildren, nieces or nephews.
The fact that your boyfriend's extended family accepts her children from a previous relationship as part of their family is commendable. His parents may be the only grandparents her children have, and those children have probably been raised as siblings to your boyfriend's children. It's not good ex-etiquette to expect these people to walk away from the mother of their grandkids or from children they have unselfishly accepted because your boyfriend has broken up with their mother and now you are his girlfriend.
In terms of lending her money — that's between her and them. Divorce complicates things financially, and they may be lending her money to help with the children. You probably don't know the particulars and shouldn't get involved.
Notice my answer began with an empathetic approach — I put myself in your shoes. That's ex-etiquette rule No. 7. It helps when discussing things that the other person sees you understand their point of view. But then I shifted the rest of my answer to using the kids as criteria for problem-solving: That's using the primary rule: "Put the children first." Once you remove yourself from the equation and use the best interest of the kids as the basis for problem-solving, the answers come much easier.
Looks like you have been asked to be a new member of this club. Make sure you can follow the club bylaws without reservation before you join.