Well.
Allan Macintosh and Jean Grant had seven recorded children, all baptised in the parish of Urquhart and Glenmoriston, on the west side of Loch Ness. See attached.
According to the 1851 census
https://freecen1.freecen.org.uk/cgi/search.pl, Allan McIntosh, 54, agricultural labourer, born Urquhart, Inverness-shire, wife Jane, 52, born Boleskine, two daughters and a grandson, were living in the parish of Urquhart and Glenmoriston (no address listed in the census transcription), so it doesn't look as if he ever patrolled at Edinkillie.
In 1841 the family, including Peter, aged 8, were at 2 Camban in the parish of Kilmonivaig. It looks as if by 1851 Peter was an apprentice shoemaker living in Nairn.
It looks as if Allan died in 1861, and Jean/Jane Grant or Macintosh in 1875, both in Glenmoriston. Their death certificates should tell you their parents' names and take you back another generation.
Boleskine is a parish on the east side of Loch Ness. Kilmonivaig is south of Boleskine, a large parish including Spean Bridge and Roy Bridge. Cambān was a pretty remote spot on tne River Quoich - see
https://maps.nls.uk/geo/explore/#zoom=16&lat=57.09268&lon=-5.28064&layers=5&b=1&marker=57.21582,-5.22267 (you may need to zoom in). It was submerged when the Loch Quoich Dam was built in 1955.
Coincidentally it's near Bunchaoile, which came up quite recently - see
https://www.rootschat.com/forum/index.php?topic=861772.0. As the Campbell family in that thread were at Bunchaoile at exactly the same time as the Macintosh family were at Cambān, they would have been next-door neighbours, although about a mile or so apart, and would certainly have known each other.