My dad was supposed to be coming to mine but has decided to spend it with his wife (my stepmother) instead, and this would be OK other than the fact she has two daughters, both of whom have partners and one of whom has two sons. I suppose in other words she has other options for people to spend the day with but I don't.
He will come to mine on Boxing Day and leave the following day so I will see him but aibu to be just a touch upset about the day itself being spent on my own?