This is only my opinion, I cannot speak for an admission committee.
Personally, I don't think having children proves any sort or thing like maturity, time management, or "loving-ness". All it proves is your cells can combine with another and produce life. Just being a parent biologically means nothing to me about the character of the person. More often than not, I see having children as an irresponsible action, (this is in regards to friends of mine, not making any judgments on any of you) especially while in school. As I see it, nearly anyone can pop out a kid, but it takes a very special kind of person to be a true parent.
If you are one of these kinds of people then power to you! I'm sure, you've learned a lot of life through your your children. I would speak about how being a parent changes your perspective and enhances your determination, but I wouldn't focus on "I'm a parent, and it's a lot of work so I can handle stress." To me, that seems like trying to use your status as a parent to further yourself, which I disagree with. People chose to have children, and should not be rewarded for dealing with life as a parent. I just don't think doing what is necessary is worthy of additional praise. If you were to explain how motherhood has affected your ambition, your desires, your goals, etc I think it would be a great way for the admissions people to get to know you personally. Like I said, I would just shy away from leaning on parenting as a crutch to make yourself look good.
Disclaimer: I say this, as a parent who no longer has a child, I have been in both situations. I just don't approve of special treatment of people who decide to be parents. (I mean things like priority seating or parking for those with kids, etc) So this whole rant is from my being a firm believer in equality regardless of status, has absolutely nothing to do with you personally, so please do not take offense. Best of luck to you. =)