You may want to repost this query in the Kings County board as that is where John Mullin apparently lived when administration of his estate was granted to Elizabeth Mullin 1FEB1825. A daughter was Mary who married John Duff and died in Woodstock, Carleton Co., NB 7OCT1842 age 43 years leaving her husband and nine children.
A John Mullin petitioned for land in Saint John Co., NB in 1785, in Kings Co. in 1796 (with, amongst others, Peter and Thomas Connor) and in 1802 (with George, James, Peter and Thomas Mullin). He received a town lot in Parr Town (Saint John) 14AUG1784, 100 ( a half of Lot 9) acres on the Long Reach, part of the River Saint John in Kings Co., NB 3AUG1784 (see surveyor's report at:
http://www.novascotia.ca/nsarm/virtual/landpapers/archives.a...for some details), and his heirs received 100 acres in Lincoln Parish, Sunbury Co., NB just below Fredericton 15MAR1826. I do not have access to the petitions, but they should be in the Provincial Archives of NB at UNB in Fredericton and they should state his origins.
A query at:
http://www.rubycusack.com/issue99.htmlindicates that John Mullin served with the Guides & Pioneers.
I notice that I have a note elsewhere:
"John Mullin, the Loyalist, is said to have been with the Guides and Pioneers in the American Revolution. He was apparently unmarried when he came to NB as he was granted only half a lot on the Long Reach in the River Saint John. John is said to have come from Pennsylvania and to have married Elizabeth Connor, d/o a pre-Loyalist, Peter Connor. Supposedly they were married in Rhode Island but, in the circumstances, this seems unlikely as Peter Connor is said to have arrived in what would become New Brunswick by 1775."
The family appears to have been in both Springfield Parish, Kings Co., NB and in Wickham Parish, Queens Co., NB. The two are close and this may not necessarily mean two, different places. The grant on Long Reach was lower down the river, on the northwest side of the river in Westfield Parish near Craig Point and right across from Carter Point. Peter Connor, however, had two lots at the head of Long Reach, just into Queens Co. above Mistake Inlet on what was Kemble's Manor.
According to Todd Braisted's site on Loyalists, especially at:
http://www.royalprovincial.com/military/musters/g_&_p/mr...the Guides & Pioneers were largely recruited in New York. John 'Mullen' is at:
http://www.royalprovincial.com/military/musters/g_&_p/gd...and appears to be on the east end of Long Island at the time. At:
https://lib.unb.ca/winslow/fullrecord.cgi?id=658&level=2...is:
Mullen, John - Of the Guides and Pioneers: settled in Bright
This seems to be a reference to Bright Parish, York Co., which did not exist until 1869 when formed mostly out of Queensbury Parish where some of the Guides & Pioneers did settle. John Mullen, however, petitioned for land in Kings Co. as early as 1786 and in Queens Co. (with James Mullen and Jacob Drake) in 1808. John Mullen did receive 224 acres in Queensbury Parish 14JAN1788. This would be a grant to a married man. this raises the questions as to whether John Mullin, in Kings/Queens Counties, was the same person. There is no reason yet to assume that he took up the York Co. (or any) grant. John Mullen, Sr. (300 acres), James Mullen (190 acres) and John Mullen, Jr. (430 acres) received grants in Sussex Parish, Kings Co. 18FEB1812. John and James could be the veterans of the Volunteers of Ireland at:
http://www.battleofcamden.org/volsofireland.htmThis is not much help. I suspect that you will have to go after the petitions and see what they say.
Thomas.