I did notice that Benjamin was living with Samuel White in 1940. Also noticed Ellen Watterson in the same household but not sure of her connection. If she was 63, means born about 1877, married at age 25, so about 1902 to a Watterson. The only sibling of Benjamin's that I don't have a spouse for is Joseph but there is no indication that Ellen is Benjamin's sister-in-law.
At first, because Benjamin Watterson that I was following (son of James Watterson and Margaret Hurl ) arrived in Philadelphia in 1895, with wife Martha, to his sister Mary Jane Steele, I was thinking she was Martha Elizabeth White since the only Benjamin I could find after that was the one with wife Lizzie. When Virginia married John Spencer, I thought she must have her mother's name backwards when she said it was Elizabeth White nee Averill. Now I am thinking I was misled by the 1895 arrival of Benjamin with wife Martha or there were two Benjamins. Thinking misled by wife's name Martha in 1895. I should have Benjamin's marriage record to Lizzie Averill in Camden, NJ on June 8,1895, any day now as I ordered it in early May. Hoping it has his parents names on the record. I am thinking Lizzie's first marriage was to Benjamin Watterson and then to James B. White. But there must be also must be a connection to the Samuel White that Benjamin is living with in 1940 and at the time of Ben's death in 1952 (same address).
The only Eliza Averill that I find in the correct time frame is born 1886 in Lurganagoose to Robert Averill and Mary Ann Semple, with grandmother Sarah Averill present at Eliza's birth. But there is no Margaret or Mary Ann in Lizzie's daughters.
Now that you give me Samuel's parents, I found his birth in Gortmillish, Armoy, District of Ballycastle, on May 6, 1874.
Update - yes there was a Robert White born to John White and Martha Brown on May 16,1870 in Gortmillish. And William born May 23,1879 in Gortmillish. And Catherine Sept 14, 1876 (this would be Cassie).
John and Martha married 1867 and he was a widower then. Both fathers had first name John.
I find the death of a John White in Armoy in 1885 but... wife is Eliza. ??Martha Elizabeth??
