Goodness this is a confusing jumble:
Patrick Lalor (1781-1856) of Tenakill, was MP fro Queens Co 1832-5. He had a son John Lalor (1815-75) whio married a Mary (or Ellen) Dunne but settled in London. One of his daughters (Mary Darcy) later settled in Colorado.
Patrick's father was also a Patrick (1732-1805) of Tenakill. I am still trying to track his father (his granparents I have the anmes of).
I am aware of one of Patrick's sisters (Mary 1792-1861) who married William Dillon and settled in Wisconsin, and a brother James (b c 1775) who went to America in 1812. He had at least one other sister who was belived to go to Virginia (I have been unable to track her there).
One of Patrick's first cousins, Mary Lalor (b c 1770) married a Micahel Doran of Mountrath and settled in Philadelphia. This might just be a coincidence of names.
John Lawler of Prairie du Chien (the railway tyconn) definately came from Rathvilly, Co Carlow tho.
In the Rathvilly R.C.. parish register index, there is an entry for John Lalor (6/5/1832) father Patrick and mother is Mary Cantwell. This ties in with his date of birth as 4th.May. There are two other children: Patrick (1833) and Michael (1836). Could this be your patrick?
Pass is a townland of Laosi about 6km east of Tenakill in a region thick with Lawlers (mostly named John and Patrick btw). Interesting - is there anything more you know about the 'document'?
As I said, what a jumble!