If Mary Sharp married John Harrison in June qtr 1938 you need to buy a copy of the marriage cert to determine her fathers occupation to link her to the 1841 entry
The fact that her son’s obit only mentioned he was related to the Sir Cuthbert suggests he may have been a second cousin or similar. If he was a nephew or grandson I would have expected it to be more precise
It’s possible the 2 Cuthberts were cousins