Hi Karen,
As far as I can tell Maxwell Waugh and wife Isabella did not have any children of their own. I don't see any in the register of births. The marriage registration of Maxwell Waugh shows his wife Isabella to have the maiden name of Kirkpatrick. Her father was Robert Kirkpatrick, blacksmith, and mother was Agnes Morrin. They were both deceased at the time of the marriage in 1865.
The birth registration for Isabella Agnes Jane Lees in 1874 names her mother as Jane Allan Lees. NO father is named at that time. By 1900 at the time of her marriage to WIlliam McKie she was using the surname Waugh.
There is a marriage record in 1881 for a Jane Allan age 24 marrying a James Coupland . Jane' s mother is named as AGnes Kirkpatrick (then married to David Blaycock). Jane Allan's reputed father was John Lees. Jane Allan was living at Sandbed of Dalswinton. This was the home of Isabella Waugh, wife of Maxwell.
If you look back at the census, Agnes Kirkpatrick was the sister of Isabella (Kirkpatrick) Waugh.
SO it looks like Isabella Agnes Jane Lees is the great niece of Isabella Kirkpatrick Waugh.
What is strange though is that Jane Allan was using the surname ALLAN. I can't figure that one out. There was another Kirkpatrick sister Jane. She married Andrew Allan in 1855 and they moved to Victoria Australia in Dec 1856.
Regards
Joanna Waugh