Yes you have found two of the family members...
PROWETT WILLIS J.,SR. 82 born 19908, died 1990
PROWETT MARIE E. Montague, 90 ,born 1907, died 1997

One of their children was Willis James, Jr. 1925-1987

Jonathan Prowett was born in Scotland 1826 his son
William Ferdinand Prowett was born in 1860 in England
Wm. and his wife Carrie Beagle had 4 sons
John, Harold, William and Ernest.
John was the father of Willis James Prowett Senior.

Sometimes the name is spelled Prewett.