Something that should be answered first and foremost, but which you did not, is whether you WANT to be a nurse, or if you'd be fine with being an office helper.
A MA is not a nurse. They may do some of the most basic of nursing skills, but they cannot assess or perform many (most) nursing functions. An LPN is a nurse, whose scope of practice (for which they are licensed by the State in which they live) is considerably different than an MA (whose scope of 'practice' is defined by the medical professional for whom they work, no license involved).
Once you decide why it is you want to be an MA, or why you want to be an LPN, and then compare what those two titles enable you to do, you'd be better able to answer your own question.
For what it's worth, as the others have said, you do have much greater flexibility in positions, hours, and career options as an LPN than you would as an MA. The most frequent complaint I seem to hear is that MA education is often at least as expensive (if not more so) than LPN education, and they earn less and "get less" as an MA than they would have as an LPN. Just food for thought.
Also, as a consideration, I am VERY family-oriented and choose to work three nights a week BECAUSE I want more time with my family. Those kinds of hours are available to nurses in my area, not MAs. Perhaps you could work out a rotating-shift schedule based on your husband's schedule to better free up your available time with your kids? Of course, NO schedule is absolutely perfect, as there will certainly be time away from your kids either before they go to school, after they get home, or on days you are working and they are home. I do my best to avoid those conflicts, and for the most part it's great, but sometimes some time is sacrificed either from work or from family now and then.
Good luck in your decisions!