I've been studying the Boylan/Boland/Boyland family and have William R Boylan (1781 Somerset, NJ - May 1841 Fulton, IL) married to Jane Carle (1790-1873 Butler, IA). I have many of their children but haven't found the Thomas about which you write. I have Margaret Ann, Sarah Margarette, David, Isaac, Eliza Jane, Harriet, Asa, James W and William H Boylan). The most information I've found pertains to Isaac Boylan. Isaac married Catherine DeMoss and had several children (Nancy, Sara, William, James, Hannah, John, Thomas Mason Moylan, Douglas and Henry).
Ancestry calculates the relationship between myself and Isaac Boylan as:
"Paternal Grandfather of husband of sister-in-law of 2nd cousin 2x removed"