We usually take turns (as I imagine many people do) spending Christmas Day with DH's and my families respectively.
Last year we spent it alone at ours as DS was a few days old.
This year it's DH's family's turn - but my sister, who I haven't seen in 18 months and who has never met DS as she lives abroad, is due to be in the UK and would like to spend Christmas with us all as a family.
AIBU to ignore the turns and thus incur the wrath of MIL?