I would not say anything,either. I deal with the type of thing often, as well. All it does is get you upset, and could hurt your children, which I'm sure you don't want to do.

This is the type of relationship that the "aunt" is choosing to have with your children. They will realize this as they get older, with no help from you. These things just show themselves, trust me.

I choose to focus on my immediate family, and those that choose to not be so much of a part of it, well, that's their loss.

HTH.

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Doing the right thing isn't always the same as doing the easy thing.