I wouldn't do it. If you read enough threads in Allnurses you will see how frustrating and difficult this job is. Not necessarily the patient care, but all the bureaucratic BS. Do you have a good work environment that allows you to do your job effectively and feel respected? Do you get a 30 minute lunch break without interruptions? Do you have sufficient time to do everything? Are you made to feel guilty if you won't work extra or call in sick? Do you have tasks added to your workload on a regular basis with expectations of getting it all done by the end of your day? DO you get out on time? Do you face the possibility of violent behavior or being cussed out from "customers" and their families? This is a very small sample of the negative work environment we all face in nursing today-even at the best places. And it's not getting better. Yes, being a nurse can be fulfilling, but it's becoming less so every day. Sure, you can go into non bedside areas (after getting 1-2 years bedside experience), but you will take a pay cut and they have their own set of problems.
Also, how long do you expect it to take you to reach an MSN while still working? You will be missing a big part of your children's lives before you achieve that.
I'm not trying to bum you out, and some places are better to work at than others, but they're in the minority and at even the best you still deal with the above problems. Most people go into nursing because it pays pretty well, there is demand (although for new RNs getting their first job can be difficult), and they feel they are helping others. But you already get paid pretty well for not having a degree, have weekends and holidays off and you will find that the "helping others" ethic has to be compromised dramatically to fulfill the bureaucratic BS.
P.S: I've been a nurse since 1991. Respiratory therapist before that. If I had to do it again I would look into x-ray tech (advancing to CT and MRI credentials) or ECHO, USN tech. Although I'm not sure it's lots better in those fields.
Good luck to you and whatever you decide.