From some hand written notes from my late Aunt(Mary Isabella Barker nee Foster) I can confirm that there would appear to have been a Jack Mclaren, George Mclaren, Jemima Marken Mclaren as well as my great grandmother Isabella Hutcheon Mclaren.
Saddly no dates and one short from your list but in order:
Jack's wife was called Margaret and they had three sons, Jim, Jack, George and two daughters Agnes and Isabella.
George's wife was called Ann and they had no family. He was reportedly a pilot on the Firth of Forth.
Isabella Hutcheon Mclaren - already covered. One son Jack and two daughters Jemima and Isabella Mary.
Jamima Marken Mclaren husband William - no surname and had a duaghter Ann Degersey Montgomery Markem.
Going one step back James Mclaren must have died young as Iabella Milne Mclaren apparently remarried. her second husband was an Alexander Carr. \canadian connection here but....?
Peter
I am posting details of the children listed on the IGI in case anybody else can find them. There is the possibility that one or more of the children died in infancy
All surname McLaren and all b Montrose
James Milne 1859
John b 1862
George b 1864
Isabella Hutcheon b 1867
Jemima Milne b 1873