Not wanting to go too deep or come across as condescending but is the thought of selling the watch driven by wanting to go on holiday and not being able to afford it? If so...
What’s more important?
A piece of jewellery or using he money to pay for a great holiday with your family and the memory’s that will generate?
Only you can decide.
If you don’t need to sell the watch don’t.
(if it were my family I would keep the watch there is only so much ‘family time’ I can stand)