Time is always the biggest commodity we have. My own kids don't need my attention that much, so when they do want it I do my best to give it to them.
But man, I'm really sorry to hear about your dilemmas. There really is only so much of you to go around. I have no advice or wisdom to share, other than to say that I'm sure that whatever you choose to do, it will be the right decision for you and your family and the well being of the girls.
Good luck! Don't make any rash decisions. I'm sure you'll figure it out.
That's sage advice, I am trying to take things slowly, but realize that ultimately one of us needs to commit more time to housework, cooking, etc. Thanks for caring my man, the gesture alone is uplifting.