12yo / year 7.
Will be coming home from school to an "empty house" but will be getting changed and walking round aunts house where there will be a birthday cake / dinner etc with the whole family.
Parent 1 is at work and parent 2 has to drop another child at a club so usually drops in to see their sibling why they wait on that day. Sibling has agreed to have a mini party for the birthday child and grandparents will pop in.
Parent 1 wants Parent 2 to wait in (and the other child to miss club). Parent 2 thinks the child will be fine / or Parent 1 can book annual leave.
[I'm the sibling and more than happy to have them over for a few hours that afternoon]