Can my son’s ex-wife claim any part of his inheritance?
As long as they’re now divorced and the court has made a “final order” dividing the couple’s assets, the ex-wife won’t have any claim on anything you might wish to leave him. Only if you were to die before their divorce and financial affairs were finalised would she have a potential claim on your son’s legacy. However it is possible for a divorce to be finalised without financial matters being dealt with. So you should check with your son that a final order has been made ruling out his ex-wife’s right to make any further claims against his capital.