I work shifts in a 24/7 environment. I f am gone some other poor sucker has to fill in. The show must go on. What we do is "business critical".
That said, I can take days off at no notice to take my sick wife to hospital. They just call in the most available substitute. Over the years, that has often been me. And it has been me being covered for.
Yes, I can be called in at any time. I've done the birthday and Christmas thing, but my colleagues have done it for me, too.
So don't fret over being "on call" all the time. If you get the right employer it can still give you a family life.
In February, I did many more hours than I was "contracted" for. In March my schedule has me doing far fewer. It might not work out that way, but that's the job.
On the whole, I manage to fit in some hugs at home.
I hope this helps.