Dear Dazed But Not Confused,
If I may be so arrogant as to use my own example...
My husband did not help at all when it came to our two daughters. I did everything - he admits that he never once changed a diaper, never, ever got up in the night, never helped get them ready for meetings etc. I was the girls everything. They are now 20 and 21. They have nothing to do with their father and practically worship the ground I walk on.
Be there for them as much as you can - you will want a relationship with them later. These young years are gone in the blink of an eye.
Magwitch