"Afton Water" aka "Flow Gently, Sweet Afton". It's a family friendly
song; it's in waltz time, so it's good for dancing. I usually play it as
a slow mellow type song with a rise in volume in the bridge, but it can
be played as a fast waltz.

"Wraggle, Taggle Gypsies."
"Down In My Sallys Garden."
"Rocky Road To Dublin" (is always a fun fast tune).

I would say "Kilgary Mountain" aka "Whiskey In The Jar", but some of the
lyrics wouldn't seem like a family friendly song, due to the prison
related lyrics from a version I know. Unless someone knows a version
with different lyrics. The melody, beat and chorus are always fun to
sing and dance along to, though.