Father: Alexander (Aleksandr) Cherlin
Mother: no information
Spouse: no information
Children: no information
Died June 9, 1942.
"Dov" and "Ber" both mean "Bear", in Hebrew and Yiddish respectively. Dov Ber was also the name of the teacher of Shneur Zalman, founder of Chabad. This name was presumably given in his honor.
Source: Ledger of the Lubavitcher Chabad, Chevrah Kadisha Jerusalem.