What's the correct answer?

A quick synopsis of my niece & nephew's short lives so far is definitely in order.
My brother met a young "lady" - we'll call her N. N became pregnant. Brother and N got married. Beautiful niece (Sweet Niece) was born. Brother and N separate. N becomes pregnant again - which was totally unexpected. Uh huh. Brother and N try to work it out - it doesn't work. N has my sweet nephew (Wonderful Nephew). Brother and N finally divorce.
Sweet Niece & Wonderful Nephew live with my mother who takes care of them full time without much support from either parent. N despises Brother's new girlfriend, K and teaches Sweet Niece to say awful, horrible things about K. Needless to say, no mother of the year award nominations from me for N! I also understand that my brother is not perfect. I know that he has done wrong as well - I am happy that he isn't teaching his children to say awful things about people.

Sweet Niece has now repeated the things that her mother taught her. To Brother's new girlfriend, K. Awful, mean things.

Last night I went to see my mom, Sweet Niece & Wonderful Nephew. At one point during the meal, my sweet little niece looked up at me full of innocence that only a 4 year old can have and asked, "Aunt Mrs. Potts? Why did mommy get pregnant with my little brother?"

"Because your mommy is a evil calculating person who should never be allowed to have children?" That was my thought - not my answer. What came out of my mouth instead was, "You know, Sweet Niece, you should ask your mommy that when you're as old as I am."

I'm bad - but I didn't say what I was originally thinking.