I think I may have a possible answer to this.
For years, when I was with ex husband, we would receive awful (but we'll meant) Christmas gifts from his mother and his 2 sisters.
It got so bad, that if we were having to open the presents in front of them, we would (prior to artival) toss a coin to decide who had to do it, and express "delight" at the contents!
One year, in plenty of time, I took the bull by the horns and suggested that we all just buy for the little ones. No one complained, and in fact, I think they were all quite relieved.
None more than me, no more unwrapping awful glitter type pictures of tigers, smoked brown sherry glasses, or an indescribable wooden object that vaguely resembled a pineapple, and was supposed to be "useful" for serving accompanied for curry
So, Singlegrannie you may have left it too late for this year, but once you have received and sent the gifts that both parties don't really want or need, just say "thank you so much, but next year shall we just buy for the children ?"