Lyle Shanks is my father. I am the only child. We lived on Old Shipyard Lane in Southold from 1953 and as you have noted my father died in Nov of 1976. He was survived by my mother, Charlotte who continued to live there until she died in 1989. My Dad was born in Ogden, UT and moved to Washington D.C. when he was 19 to get a job with the US Dept. of Agriculture staying with them until he retired at about age 63.
Why do you seek his death certificate? Actually, we have been thinking of doing an ancestry.com search about the Shanks, Browning and Burgess family histories, but have not yet signed on. My Dad's Mom was Lena M. Shanks, born as a Browning with 10 siblings if this helps.
My contact is firstname.lastname@example.org