For the last 20 years, my brother and I have seen each other for approx 3 hours a year - we live a long way apart, have never got on, and he only visits my parents twice a year for a few hours to get things from them.
Parents are aging badly, and I (and DH) invited them to ours for Christmas which will involve 6 hours of driving to get them and take them back. Mum turned on the pressure to invite brother so 'he wasn't alone for Christmas' (he's single, but has previously turned up at theirs at 9pm Christmas eve and gone after lunch at 1pm on Christmas day by his choice).
I've been a good daughter and invited him, but am now having wobbles about having him here when the PIL are here too, and whether its going to wind my dad up too.... Eeeek..