I can relate. 3 years ago I was 37 and my youngest 7 months old
And I'm the same height
In addition to eating more, try to
prioritize sleep. No TV or reading or whatever you might be doing in the evening when you're tired after work and kids and everything. Sleep as much as possible. Kids interrupt and reduce sleep, but sleep is vital for optimal recovery and health.
I completely agree. So you squat "only" 170. How much you think you'd squat if you didn't train at all? When your kids are older and you sleep better (and prioritize training after family and work over most other things), you'll probably progress faster. You're not in a race. Just do your work.