I'm in a similar situation - 3 kids, and I'm doing it part time. (And I'm 38!) I did my degree part time 10 years ago and was obsessive, so my family are ready for the pain. I'm (fairly) undaunted by the prospect of all the work, really because I was under no illusion it would be easy. Part time and family, something WILL give. It's better to know beforehand what that is..