You generally play 18 holes, right? Maybe you could play 9 for a while if it leaves you incapacitated for a day afterwards?
That sounds so hard and I´m sorry you´re having to deal with it It must be confidence-destroying for the kids too, to get dropped off with their grandparents (loving and wonderful though they are) every time their dad "has" them.G & I both feel that we are being taken advantage of, but fear estrangement by him if we speak up. His partner seems very needy & demanding & I know he defers to her in almost everything. She has already turned him against me once for some perceived snub, which still hurts a bit.