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I would suggest Jamey Aebersold's "St Loius Blues"--Volume 100 It's a playalong book and CD with 17 dixieland standards. Your sisters can read the Bb section and you can make up basslines from the chords or read the bass clef section. You can all play along with the CD until you're ready to go at it alone. Good luck.
Peace. ASG
p.s. this is the Jamey Aebersold site http://www.aebersold.com/Merchant2/merchant.mvc

You could even use trios for 2 trumpets and 1 trombone - that's a fairly common combination. Clarinet reads in the same key as trumpet, and the trombone part would sound ok down the octave where necessary.

We will soon have a duet composed by Antony Paasch for Clarinet and Tuba. It will be 5 movements:

I. Chorale
II. Tango
IV. Minuet
III. Passacaglia
V. Canon

Please check the Cimarron Music Press site. My guess is that will have it completed by the end of the month, no guarantees there!

Take care,