Newbe Paul expressed lots of HIS wants and got lots of good advice from
earlier posters. He also said

" I want to take my wife and two daughters, but the girls are too young -
four and nine years old. I want them to remember this, and to experience it
themselves..."

Um, as a fly fisherman 50+ years with one wife and two daughters now over
30, my advice is don't get your hopes up too high "want them to remember
this, and to experience it themselves". The probability of getting all
three women in the same family to enjoy fly fishing is pretty remote IMHO.
In time, you MAY get all three to experience it. If all three do, all three
will surely remember it for the rest of their lives. And furthermore one or
more will probably gleefully remind you of that experience the rest of your
life - LOL.

A more realistic expectation would be for one of your daughters to get to
like fly fishing, well maybe enough to marry a fly fisherman some day.
Maybe even you could hope that someday your wife would ride along in your
plush, air conditioned RV while you go fly fishing. LOL My bet is that
you'll be very lucky if someday you could get just one of them to clean your
fish! grin

But seriously, take the girls to a "pay" trout pond and get them started
"Catching" fish, then take the girls bait fishing for bream or bluegill to
keep their interest up. Gradually over the years move them up to just going
fishing with Dad and last if someone is interested, let them catch their
fish on your fly rod.

Paul, it's OK for you to take up fly fishing. Welcome aboard and good luck!

Keep posting those questions.
John