Gender: boy
School:
School #1
I clicked on Lejbus randomly and came up with this boy when I clicked on the similair names search. School #1 was for boys 9-15 which fits for this boy and the names are an extremely close match
I found the entire family by searching Blizinski on the USHMM name search. The boy Jankiel Blizinski is the only one who did not move with the family to the second ghetto house of SUD 7 but he moved to SUD 4. The dad as well as the brother's names are Gitman