I may have some information that is helpful. My Mc/MacDonald ancestry is from Arnprior area. I have linked Margaret Scott MacDonald (1st husband Alexander) and Samuel McDonald to John McDonald and Isabella MacGillivary (excuse my spelling. Margaret and Alexander being John's parents.
Isabella and John McDonald are buried in St. Alexanders Cemetery in Sand Point. (Cemetery land donated by Alexander McDonell and Janet Young) Penelope McDonell(parents married Ranald McDonald 16-1 Lochiel. (buried at St. Alexanders as well) Her daughter Flora McDonald married John Brennan (obituary is on the Glengarry Genweb) They are also buried at St. Alexanders. My 3x grandfather Alexander Scott McDonald from Braeside married Mary Hickey. It is said that Penelope made sure all her children were born on Alexandrian soil. Alexander's mother Ann who was the daughter of Margaret Scott and her 1st husband Ann married a farmer in Alexandria. We do not know his first name. He was also a Mc/MacDonald. Alexander who married Mary Hickey was born and lived in Alexandria before working in the Lumber industry. This family tree is very complicated with so many marriages between Mc/MacDonalds and Mc/MacDonells with many spellings and joining different branches. I would be interested in discussing this with Ms. annand and James Allan. I am finding many of my distant relatives in your firstname.lastname@example.org