John King born about 1780 & his wife Elizabeth their daughter Margaret King married James Evans and their daughter Rebecca Jane Evans married Stuart Gibson and there daughter Margaret King Gibson was born in 1837 in St James, Charlotte county New Brunswick, and she married John Russell Blair in 1863 in St James Charlotte county New Brunswick.
You have John King wife /Elizabeth surname as Leeland, I never knew her surname where did you confirm her surname ?
For the family`s you are searching you might find some info in a few different places in New Brunswick Canada , places like McAdam N.B., Marysville N.B. ST Andrews N.B. St Stephen N.B.
Charlotte County N.B. and York County N.B.
Hope this helps abit