Whatever's going on between the parents, I think the best you can do at this point is, if feasible, contact the mother yourself, preferably with your son's blessing, and very sweetly offer her a nice week off while her child comes to stay with grandma.
Or, if that's not in the cards, make yourself back off some mentally and re-focus on the other things that are (or could be) in your life instead. I don't mean to be flippant. It's just that when you're not one of the parents, there's really not much else you can do.
By special request, let’s discuss our favourite Classic Music and why?
Last letters make new words - Series 3
