I know you are from a Alexander Grant and Sarah Claridge.
We have heard of John Grant of Lachine but do not know his family. I am working on two Alexander Grants in Glengarry after the Am Rev war. My ancestor, John Grant, came out with 8 of 9 children in 1785 via New York and Albany arriving Montreal 1786. He married a 2nd time in Montreal 1787 and I come from their youngest son, Alpin, born 1802.
Earlier I did find the OC's from two of your Richard's siblings. I think I gave year 1813, it should have been 1823. Children had to be 21 years to get land as a UE.