I would go because it’s your family but arrive a bit later no excuses. The child’s priorities come first which is not always practical for guests. I always had a small party for my children with just their friends being dropped and picked up. My parents were both not well and other family were working.
We have been invited to parties (not by our own children) at bizarre times. Even when working running a business being expected to lose business for parties.
Early afternoon tea parties for toddlers or burger afternoons for teens but we gave them a miss.
A quote for those blessed with a spouse:
I hope the new PM is kind to Larry the Cat



