Richard is a very unusual name in the Tear 'clan' with only 1 I can see born between 1770 + 1820.
Earls and Lords are in very short supply on the Island - nor would Manx sit in the House of Lords.
While not totally dismissing your family history it does have some of the hallmarks of embroided myth - born to a high status family (? illegitimate) but marries well beneath him and is sent off to the colonies ...
Were there no Canadian census that give his age - death notice etc ?