Definitely the home care job. I always worked contingent or not at all when my kids were your kids' ages because I wouldn't have been able to leave them for 40 hours a week and miss out on so much with them. Sure, I could have made a lot more money over the years than I did, but compared to time with your kids that you can never get back again, what's money?
Now that my kids are 20 and 17, I have accepted a part-time day shift office job. While I love the job itself, I am amazed at all of the extracurricular "stuff" that comes along with it (employee meetings, extra training, company holiday dinners, etc.) that are required and take extra time away from my family. It doesn't amount to 40 hours a week, but still...if my kids were younger there's no way I would do this job, because when it came down to pleasing my kids or pleasing my boss, it would be a no brainer. :heartbeat
Good luck with whatever you decide.