I can't quite fully relate, but I had my children while I was in undergrad. Now I am in a very demanding post graduate program. My children (DD-6, DS-5) are very aware that my schedule flexes based on the amount of work that needs to be done. It makes me feel like a bad parent often. Most days (and weekends) I spend working long after I pick them up from daycare. After their Dad died I got even busier dealing with all the things he would do as well. I try my best to use my down times to make it up to my kids. I don't have any advice on how to help, but I am here if you ever need to talk. (hug)