I'm wondering if Zenas married his widowed sister in law?
1881 - Eliza Sheen b Whetstone c1844
1871 - Eliza Sheen b Whetstone c1851 is married to an Amos Sheen b Cosby c 1843
Marriage appears to b 1870 - Amos Sheen and Eliza Haines. There's an ELiza Haines b Whetstone c1844
1851 - Amos b c1843 in Cosby has older brother Zenas
Believe you are quite right Mabel
(1) SHEEN, ALBERT       HAINES  (died aged 0 in 1882)
GRO Reference: 1882  J Quarter in LEICESTER  Volume 07A  Page 209
(2) SHEEN, ALBERT       HAINES  
GRO Reference: 1886  J Quarter in LEICESTER  Volume 07A  Page 229
(2) Married 1907, Elsie Kenney. No children in 1911 & Albert a widower by 1921
     Married 1923 Doris M James. Doris M (May) Sheen a widow in 1939  dob 1896
Albert died 1938.
John