McLa(o)ughlin from County Mayo

I am looking for information on the parents and siblings of Terence McLaughlin (sometimes known as Thomas), b probably in Rosslee, County Mayo, Ireland about 1802. He married Margaret Hopkins in Aglish RC Parish 14 Jun 1828, and moved with his family to Sheffield, England about 1846.  He was a tailor.  He died in Sheffield 28 Aug 1860.  I have considerable information on his descendents, and would be happy to share with anyone researching this line.

Terence's siblings were:

Peter, b about 1800, likely also in Rosslee, maried to Sally?  and producing three children (Anna, Mary who wed Lawrence Sullivan and Winnie who married someone named Flannary).  Peter reportedly came to America, and I think I have a line on that, but am continuing to document.

Catherine aka Kate McLaughlin, b abt 1803, married Owen Ward.  Reportedly Kate came to America after her husband died, likely about 1865.  She produced three children (John, William and Julia Ward).  I have done little research on Kate.

Mary McLaughlin b abt 1805 who reportedly married a Francis Lavelle. It is possible that this couple is listed in Oughaval Parish, Mullagh, County Mayo, as there is a couple in the census named this way.  I just don't know if they're mine or not. 

The only other information I have is from a 60 year old family tree written by someone who did a little research.  It says the mother of this crew is Mary Ford.  I have had no success finding a Mary Ford in Mayo at any time, but if she were to be the mother of these McLaughlins, it's likely she'd have been born about 1775.

Any possible connections would be appreciated. 

Sharon McLaughlin Gowen