Roman Lewandowski Family - 1920 Census - Jersey City, NJ

1920 Federal Census

Roman Lewandowski family

46 VanWinkle Ave. in Jersey City with his wife Mary and his children:
Lottie (26),
Kazimera (25),
Roman (24),
Lucy (23),
Victor (21),
Paul (19),
Emil (16),
Ferdinand (14),
Gabriella(11).
Roman was 56. Arrived here in 1889, around age 31. B. around 1864.
Mary was 52 in 1920 and arrived here in 1889.
Roman's occupation is listed as Funeral Director.
I need to know Roman's parents names to see if he's related to Joseph Lewandowski who lived at Roman's address shortly after Roman and his family moved out, and who's 1910 death certificate was signed by Roman Lewandowski. I think they may be brothers.Can you help me? Joseph was born in Prussia some where.Joseph's parents are Maciej ad Malgarata. Tnank you.