John DUNCAN & Mary Ann McCONNELL, also McLAUGHLIN & DOHERTY

I'm looking for more info on GGG Grandparents; James DUNCAN & Mary Ann McCONNELL. - Place of DUNCAN origin, marriage, births, possible siblings and/or parents? Connections in Co. Donegal & Co. Londonderry.

Oldest son Robert DUNCAN born January 1827 in Ireland, still looking for Baptism.

Rev. Wm. McClure’s Register
Register of Baptisms in the Congregation of Londonderry.
(Copy of actual document)
Birth: June 22, 1828
Baptism: July 10, 1828
Child: Esther DUNCAN
Father: James DUNCAN
Mother: Mary Ann McCONNELL
Residence: Bishop’s St., Labourer

Church of Ireland
Taughboyne Registers
(Online transcript)
Baptisms solemnized in the Parish of Taughboyne in the County of Donegal.
Baptized: December 11, 1829
Child: James DUNCAN
Father: James DUNCAN
Mother: Mary Ann McCONNELL
Abode: Goretree in the Parish of All Saints
Trade: Weaver
Performed by: John Gage Ball

Then 5 more children born in Frampton, Quebec, Canada.

----------------------------
James DUNCAN had two sisters, in Rev. Wm. McClure's Baptism Register 1820's:

James McLAUGHLIN (Listed as "1826 heaver of Mr CUNNINGHAM St. Johnstown" - 1828 "works for Mr McCREA" in Derry.) & wife Catherine DUNCAN.
Who would Mr. CUNNINGHAM be? Could Mr. McCREA be the merchant/ship owner?

John DOHERTY (listed as "formerly of St. Johnstown Congregation") & wife Rebecca DUNCAN.
I don't know where to search for John DOHERTY in St. Johnstown.

Approx. 1830 all of these people arrived in Quebec, Canada where they settled.