From superman.nu: Supermanica
The secret identity of Blackstarr, enemy of Supergirl. Rachael is the daughter of Chaim Berkowitz, a simple Jewish tailor killed during the Nazi occupation of Poland, and his wife Ida, who is Supergirl's landlady in her identity of Linda Lee Danvers (SG2 No. 13, Nov 1983: "Echoes of Time Gone By!"; SG2 No. 14, Dec 1983: "Star Light, Star Bright...Blackstarr Rises Tonight!"; SG2 No. 15, Jan 1984: "Starrfall").