On the 1910 Census, the household of Harris "Sholk" = Harris Salk includes two cousins, Harry and Jacob "Hillkin", age 24 and 20, and a niece, Mary "Sholk", age 20.
In the 1952 obit for Mary Hilkin it states "Mrs. Hilkin was born in Russia, daughter of the late Benjamin and Hannah Solk."
It also mentions "Mrs. Hilkin was the widow of Harry Hilkin."
Mary's obit: https://www.newspapers.com/article/the-daily-record-september-27-19...
The combination of this and the 1910 Census is enough to suggest that Harris and Benjamin are brothers, but there is more.
In the 1942 obit for Benjamin Solk = Benjamin Solk it says "He was born in Russia the son of Charles and Sarah Solk.
it refers to his daughter "Mrs. Mary Hilkin of this city" and also "one brother, Harry Solk of Long Branch"
Benjamin's obit: https://www.newspapers.com/article/the-daily-record-benjamin-solk-o...
The Find a Grave Memorial for Harris Salk = https://www.findagrave.com/memorial/207703512/harris-salk
It claims "Birth surname was Solk
Son of Charles and Sarah Solk"
And it has a photo of the Gravestone showing Harris' name in Hebrew, including his father.
Plus
The Find a Grave Memorial for Benjamin Solk = https://www.findagrave.com/memorial/207703580/benjamin-solk
It claims "Son of Charles and Sarah Solk" and includes Mary Solk Hilkin among the children it lists and links to.
And it has a photo of the Gravestone showing Benjamin's name in Hebrew, including his father.
And
The Hebrew for the father of Harris and the Hebrew for the father of Benjamin is the same.
