Father's brother Leib Komarovsky, who was killed in the Second World War. The photo was made in the 1930-s in Kiev.
Father was followed by his brother Leva (Jewish name - Leibl), who was born in around 1898; then brother Gersh, born in 1901 and brother Mitya, born in 1903. The youngest was sister Rebecca, Riva, born in around 1908.
Leva, or Leibl, lived in Chernigov and was a simple worker at a plant. Gersh and Mitya lived in Kiev, but I don't know what they did and where they worked.
Their sister Rebecca finished some courses immediately after the Revolution and became a junior school teacher.
Father's brother Leibl Komarovsky was killed at the front. Both of his sons Boris and Mark Komarovsky were killed as well.