AIBU? I’ve been with my partner 25 years on an off, during our off times we both had children with other people! Now we are officially back together and living with his youngest who is 13. (My dd is 21 and lives by herself) so my 13 yo stepdaughter got herself into trouble as she was sneaking off to meet boys, arranging to fight a girl at the park and lying every step of the way, well I grounded her and took away her iPhone, her phone was put on the shelf in the walk-in cupboard. Ff a couple of weeks and partner decided to decorate, everything on the shelves in said cupboard was thrown in the kids room in a big pile on the floor, now it can’t be found! Stepdaughter been moaning to her dad and now her mum is calling my partner saying I should replace the phone! Stepdaughter isn’t without phone she is using her old iPhone. So AIBU by saying no I won’t replace the lost phone?