Gender: girl
School:
School #17B
Based on the addresses, these are the best fits for Laja's family.
There is also an Aron Urynowicz who does not start living with the family initially, but the second address is the same as the second address for the family. Maybe an uncle to Laja who moves in with them when they go to the ghetto?
Sadly Lejbus Josef is marked "GEST 6.4.42".