Socialite Rebecca Grossman has filed an appeal in her murder conviction as she was transferred to a California state prison to begin her sentence, RadarOnline.com has learned. Grossman was convicted of the 2020 murders of Mark Iskander, 11, and his younger brother Jacob, 8, who were fatally struck by the socialite’s vehicle as she was speeding through a Los Angeles neighborhood after drinking at lunch with her lover. In February, a California jury found Grossman guilty of two felony counts for each brother for second-degree murder and gross vehicular manslaughter, as well as one count of hit-a…