I'm afraid that the title of your post says it all, Smowball.
You cannot please your family.
However, there is no reason to continue as you are.
You may or may not have made bad decisions when you left them all those years ago, you may or may not have made good decisions then. You cannot undo them.
You cannot make your children be the people you would like them to be.
The only person you can change is you.
You have to decide whether it makes you feel better or worse to continue to be 'used' by them, or if it would feel better or worse to cut off communication with them. Or get to somewhere in between those extremes.
Whatever you decide it has to be centred on you as, to reiterate, the only person you can change is you.