This is not hard to do, and you can probably do it yourself with a selfhelp book from Nolo or such, but the harder part is tuning up your crystal ball ...
What would happen if your daughter, or her current or future husband, declared bankruptcy? Your timeshare would be an asset of hers/theirs and subject to liquidation.
Children, as in plural? What if Susie won't pay her share of the MFs, or wants it every 4th of July, and the other kid(s) object? What if Billy wants to sell it, and the others don't?
If you have a trust, it's better to add it to that and let the trust document and trustee decide. And failing that, I'd leave it to one individual in your will, although now you potentially have a probate in another state to deal with.