The ukulele styles might work. They have that "kid song" sound.

I used one of them here:

http://www.floydjane.com/Songs/PerfectFriends.htm

These were the RTs used:

Key=C , Tempo 195, Length (m:s)=2:52

Style is _UKES140.STY (Folk Swing with Ukulele (140 RS))

RealTracks in style: ~1137:Bass, Acoustic-Guitar, FolkSwing Sw 140
RealTracks in style: ~1143:Ukulele, Strumming FolkSwing Sw 140
RealTracks in song: ~1098:Guitar, Acoustic, Rhythm JazzSwingFreddie Sw 190
RealDrums in style: NashvilleBrushesHillbillySwing: a: Sidestick, Brushesb: Brushes, Stick

150+ Songs produced using BIAB RealTracks
And 50 more...
and some more...