Ungrateful people. A little recognition and now they want litigation.
Who knows... how on earth does one expect to win a suit on the basis of unrecorded promises.
He might instead teach his girls that if you want it to be enforceable, put it in writing.
If they were to perform in exchange for publicity, then that should have been the terms that were agreed upon. It sounds like all they wanted in exchange was a venue to sell their albums.
A “word” used to be sufficient among gentlemen.
If the agreements were verbal, hate to break this to poppa, right or wrong, legally you are going to lose.
A verbal agreement is only worth the paper its not written down on.