Agreed with the consensus. I don't think anyone could fault you for making those changes, especially after you've talked with several other owners.
I agree that fantasy football will be the last thing on this owner's mind now, but in situations like this, once you do get back to fantasy, it's always nice to see that your leaguemates are watching out for you. On those grounds alone, you're doing the right thing.
Quick note: it can't hurt to find a way to let this owner's opponent know what you're doing beforehand.
Hope daughter and fiancé are all right!