We're a family of 4: me, DH and 2 young kids. MIL lives nearby on her own, is in poor health and DH is her carer.
MIL had a partner, who I'll call Tom, who died a few years ago. Tom had a brother, Peter. Tom was ill for a while before he died so MIL, Tom and Peter spent a lot of time together. When Tom died MIL kind of inherited Peter. Peter wanted more from MIL than she did although he used to come to hers often and stay for days/weeks.
They fell out often and he would go home but he'd always end up phoning her from her local pub asking if she wanted anything brought in and would go to hers. He has no other ties to where she lives but came from 30 miles away to go to that particular pub after she'd told him to leave her alone.
In his defence he has looked after her a lot over the past few years taking her to hospital appts, visiting her in hospital daily when she was very poorly, taking her to treatments, getting her shopping etc. At this time DH was working a lot so couldn't do these things. Now DH is her carer he takes her to everything so Peter is no longer required to do that.
Anyway, they fell out again recently and MIL said that was definitely it this time (it always is) however DH went to hers yesterday and Peter had turned up the day before so 3 days before Christmas. He has no family in this country.
He came to ours for Christmas dinner 2 years ago because we found out he was planning on staying in MILs house himself whilst she came to ours. This was right in the middle of him looking after her so we invited him as wouldn't have had him staying at hers alone on Christmas day. Since then though we've found out how annoyed MIL is by him and that he takes the piss when staying at hers.
DH and I have had a rough couple of years and normally host our families at Christmas however this year we wanted it to be just the 4 of us (and MIL). We have been so looking forward to it.
Now we are thinking we'll need to invite Peter as he's rocked up back at MILs with his feet under the table again. I can't help thinking he's done this on purpose. 3 days before Christmas when they haven't spoken in weeks?? MIL had been ignoring his calls/texts. Peter will know that MIL will be coming to ours and if he doesn't go home today he won't be able to go on Christmas day as no public transport. DH will be going to pick up MIL tomorrow and it's likely Peter will be there sitting in her living room and being left whilst she comes to ours for Christmas dinner.
I feel guilty at the thought of leaving him but I also feel he's being manipulative. We want a low key, quiet Christmas with the focus on ours kids which we promised them especially as our house is usually so busy on Christmas day and our focus is normally on hosting.
Would we be unreasonable not to ask him??