If you're interested at all in learning to dance. Go. Take classes. Tell him or not, doesn't matter. As far as being coordinated, don't make me laugh! It has taken me years to become as bad as I am at dancing! I am not being self-depricating when I say I do not have a natural talent for it and I'm not really all that graceful. I started b/c I was interested and H is a dancer (and sadly actually very good). I've done ballroom and Latin and even I managed to be in a few performances. So don't sell yourelf short.
I hope your sone feels better soon and you all have a good weekend.
BTW, just as an aside H talked about us telling the kids and then it was quite awhile before we did. That is after the initial "Mom and Dad are having problems" thing.