Butler and Roche Family

I am looking for information on my 4x Grandfather, James Butler and his wife Catherine Roche.    We have a copy of a letter from a nun who was in the same order as Mary Anne Butler, their daugher.   The letter states that James was a merchant from Tipperary and went to went to Castletown Roche, County Cork, and there met, and later married, Lady Catherine Roche. 

In 1793, there must have been a persecution for Catherine and her mother, (I suppose her husband was included), were ordered to renounce their Catholic Faith or get out of the country   They came to Germantown, Pennsylvania.   They had several children in Philadelphia, PA.    We have documentation that James was a merchant seaman and was a Captain on several ships.    

If anyone can give me any information on them, I would appreciate the help.

Christy Butler