Since most kids are usually curious, it is odd that they do not ask about you. Several reasons can contribute to this and one being that maybe they are having loads of fun that they do not ask about you. It could be also you did not have a strong bond with the kids.
Sometimes kids can be more mature than they seem, they might not want to bring it up because they think it might hurt someone. I am 12 and I have divorced parents, I know my dad went through it rough, so I try not to talk about my mom when I'm with him.