mac/mclellans in glengarry co. ontario

My ggrdf John MacMillan married Margaret McLennan believe in Inverness Sctld. Margaret's brother's name Peter McLennan, sister carolyn married to ?Grant carolyn's daughter Grace Campbell famous local author. Margaret's father's name believed to be Peter.

My ggrdf &ggrdm (John "Roy" & Margaret (McLennan) MacMillan ) had five children that I know of named John (my grdf), Sara, Alexander (Sandy)
Margot (died at sea as an infant)and Angus.

My grdf John MacMillan was a noted electrician who lived in glengarry co and Cornwall, Ont Cda who worked with and for Thomas Edison
installing the first electricity in Canada and U.S locations.

Any relatives out there? Would like to hear from you.