There are plenty of shanties and foc'sle songs out there that aren't too risque.

I'd suggest that you go onto half.com or ebay and do a search on sea music and shanties - there are plenty of reasonably priced CDs out there. Ater listening, you'll find a number of songs that suit you and then you learn the words or goggle for the lyrics.

Don't be afraid to make a few changes if there's a word or two that might not be PC. Better the kids fall in love with the music - if they do, they'll look for more later on and can make up their own minds as to what they want to sing. You might want to hold off on Oscar Brand's "Bawdy Sea Shanties". Though that was a favorite of mine and my mom back in the sixties. We would check it out at our public library every other week. boy, have times changed.