Gordon & Anne: The McGuffin's in Ontario: James McGuffin's third child William McGuffin have always believed that there were 14 sons in total.
The London Township book states that there were 6 brothers that Gordon named plus Sarah Jane "Sally" McGuffin (b.1811) who came up some other time. She married Caesar McLeod. All her information is in the book. They went to the families and where there was lack of history or family numbers, they went to the Jesus Christ of Latter Day Saints genealogy database and came up with Sarah. We had always believed that James' daughter Sarah Jane McGuffin was nicknamed Sally.
Also, they state that James' father is James McGuffin Sr. and he was married to Sarah (McLeod) McGuffin and came over with 12 children, two being conscripted into the army.