In-laws alternate Christmas between us and sister-in-law. Step kid of sister-in-law has tested positive so in-laws can't go round to theirs on Xmas day. We're going to my parents. Do I need to invite in-laws to my parents now? I'm not good with social etiquette and stuff like this. My mum cannot stand father-in-law and generally the two sets of parents don't get on they just polite at birthdays and things. In-laws have other options like a nearby brother of mother-in-law s.