Let me allay your fears. No one is going to complain if you tell your kids those things. It would be appropriate to say something like, "As Michelle Obama said, 'blah bah blah'" if you decide to quote her almost word for word, though.

The uproar part is more because of the juxtaposition of having the GOP nominee's wife use the words of a person who is probably one of the top 10 most reviled public figures in that convention hall. Couldn't she have ripped off Nancy Reagan?