I ran an exact search for "L* Edelkopf" and Luzer Edelkopf was the only result. His birth date corresponds to the age range of the students in School #12B.
I ran an exact search for the last name Edelkopf in the general name database, and found 4 entries (besides Luzer) who lived at the exact address listed in Luzer's entry (Tal 11 23). Jakob and Szajndla Edelkopf, born in 1903 and 1902 respectively, would have been in their early 20s in 1927 when Luzer was born. Their ages, and the fact that they shared an address with Luzer, led me to the conclusion that they may have been Luzer's parents. Mojsze (born 1937) and Abram (born 1929) Edelkopf were also listed at the address Tal 11 23, so it seems that they may have been Luzer's younger brothers.