Have you tried locating birth cert for Edgar L. in New Haven, Conn, where he listed as his birth in 1940 census? It might have his mother's maiden name. Also, might want to look at "Moulton" as this is her (probable) niece's name in the 1910 census who was also born in Canada. She could be a male sibling's daughter. As for burial you might want to look towards North Hempstead, Nassau county area as this was last location listed before George L. passed away & might be where both Elizabeth & George can be located. Good luck.