I'm in an odd position as SWMBO and I don't live together but spend weekends together. Therefore, in her mind gigs are an intrusion into *OUR* time. Neither of us have children so that isn't a concern. That said, she doesn't mind the odd night out watching the band and quite enjoys the rewards that comes from the gigs e.g. a holiday, treats, meals out etc
This is the complete opposite of an ex who effectively acted as as a 'tour manager' at gigs - sorting everything out from time to arrive, place to stash gear, helped load in/out to learning how to run the lighting desk!
In both cases, I was a musician before the relationship began and so it was an accepted part of who I was/what I did!