This year it was going to just be me, DP and DSS ( like it was meant to be last year but we had an old friend of DP's gate crash at the last moment), but now my DM is free this Xmas (she was meant to be working abroad), and FIL has an injury and as step-MIL (who Is a judgmental bitch and can't even keep her mouth shut and be civil) can't do the cooking we had a feeling we might be invited to come over (if DP cooks that is). But... it's likely that we will only know if we'll have DSS (who is resident with us and rarely sees his birth mum) or not about 2 weeks beforehand and my DM really dislikes my FIL and SMIL and finds it difficult to be around them. We don't do big Xmases - I don't like mindless overconsumption and I'm not Christian and was brought up with more emphasis being placed on the solstice than Xmas itself. That works for DM but that's not what the inlaws do.
What the hell do we do?