On the job. When I need to learn a new skill for a work-related project, I do. I dabble on the sides, to know what is going on in the larger tech world, but I don't fully skill up until work actually demands it.
I do think it is possible to keep up on skills while raising kids. But I'm not sure that you'll be happy with the decision to do so when you are 50, the kids are grown, and you find that your skills are getting outdated anyway, your career is winding down anyway, and you have 20 years of memories of sitting at a desk while your kids do things without you.
Make your own choices, but most old people will recommend you let the career slide a bit, and spend time with family.
I do think it is possible to keep up on skills while raising kids. But I'm not sure that you'll be happy with the decision to do so when you are 50, the kids are grown, and you find that your skills are getting outdated anyway, your career is winding down anyway, and you have 20 years of memories of sitting at a desk while your kids do things without you.
Make your own choices, but most old people will recommend you let the career slide a bit, and spend time with family.