McElroy Powell County Sligo

Looking to verify George McElroy's (1776-1871) marriage to Mary Powell (1777-).  Was Mary's father James Powell (1760-) of Kilfee?  A James Powell was born Cuilmore, Kilfree and died Powelisborough, Leyny, Achonry.  His father may be a John Powell (1732-1816).  Have found this on Family Search but can not verify any.  George and Mary's daughter was Catherine McElroy, a great, great grandmother.  George's father was also George (1740-).  His mother was Elizabeth Keen/Kean (abt 1741-) Carnacrune, Sligo.  As far as I can determine, all parties were in County Sligo.  Thank you.