Chaim Kazriel Abramowicz shared the exact same ghetto addresses and would have been in the right age range to be Pinkas Abramowicz father.
Rojza Abramowicz is in the right age range and shared the exact same ghetto address as Pinkas Abramowicz. She is slightly older than Chaim, but given the limited number of people sharing the exact same ghetto address, I believe that a strong case can be made for this being his mother.
Also, a Laja Abramowicz was found (D.O.B. March 23,1932). This would have made her four years Pinkas’ junior. The age range, and the exact same ghetto addresses leads me to my belief that she was a younger sister.
Laja and Pinkas were transferred somewhere as indicated by the ghetto note in the HLDA database A.G.28.9.42. this occourred on the exact same day for both of them. The mass deportation of the children and the elderly that occourred in September was from the 5th through the 12th. Also, Pinkas would have been outside of the age range, so it is unlikely they went in that train car to Chelmno.