Kate, this is one area where I wouldn't go. If she can make new friends, either male or female, all the better. As you've said, your mom and dad never had much of a marriage, so she's ready to do something more. At her age, a new man may be good for the situation...who knows? My dad moved on very quickly also...and it's been the best thing for him.
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If we couldn't laugh we would all go insane ~ Jimmy Buffett