So kids Dad and I club together at her request to buy a computer/notebook for her birthday and sadly at a sleepover birthday party at ours a friend accidentally spills soup on it so computer trashed . DD upset obvs so I say we'll get another one . Dad an IT geek who'd chosen it originally orders another and I ping him 1/2 the cost again which I'm very happy to do . Today I find out he expects her to refund him his share of expenditure for the replacement computer . WTF ! We're separated , he has no other kids and apart from his 'principles ' forking out again is back pocket change to him AIBU to feel we should replace ourselves ?