We'd booked a villa abroad with another couple (including my best friend / bridesmaid) 14 months in advance as we got a good deal. Each couple paid a deposit of £350 on booking. A few months later I found out I was pregnant with my first child (we hadn't planned it at that point in time but it was happy news). I told my friend and she asked about the holiday - I said we'd be ok to go still, our baby will be 5 months by that point. My friend however said they didn't want to go with a baby in tow (a bit frustrating but I understood their concerns that it wasn't what they'd signed up for). She's now requested that I send them £350 being their share of the deposit. This will mean I'll have paid £700 deposit and also have to shoulder the entire £2500 cost of the villa unless I can find others to go with. We probably can't afford this as I'll be on maternity leave. I can understand they don't want to come on the holiday but think its a bit unfair requesting the deposit back before we've even found someone else to take their place.
YABU - pay them their share of the deposit
YANBU - do not pay them the deposit, it is their decision not to come