You should consider swim lessons/swim team for them.
Perhaps ASG. ;-)
It's a thought...it really is. I was thinking more along the lines of snorkeling or even scuba eventually.
You know how terrified I am of deep water. I don't want them to be concerned with it. So far, I must be handling it well, because Mom's fear of deep water is considered something requiring good-natured teasing. It's a source of great amusement whenever we go over a bridge..."Hey, watch Mom freak!"
See this?
http://www.scubarangers.com/aboutsr.html