Looking for emigrees

I am looking for information on my ancestors and lost relatives.
Unfortunately, I do not have a lot to go on since records and
information were lost in fear of persecution following the Russian
revolution.

I know that my great-great-great grandparents came to Odessa, Russia
from Berlin via Copenhagen possibly sometime in the 1840-60s. My
great-great-great grandfather (Julius Neumann) was an engineer and came
to Odessa to oversee railroad construction.

They had a daughter Alvina Neumann and a son names Julius Neumann
(Jr.), I am not sure where either of them was born or when.

Julius Neumann we believe was married to a French woman and escaped to
France during the revolution (they might have had a daughter named
Katie).

Alvina married Konstantin Speridonavich Borodin and they had at least
three children, one of which was Elena Konstantinovna Borodina born on
the 2nd(?) of May, 1888 who was my great-grandmother and the other was
Vladimir Konstantinovich Borodin who I believe fled to France during
the revolution.

He was born after 1988 in Odessa. He was a lawyer in Odessa, and was
about 25 around the time of the revolution. He most likely left Russia
in the early 20s.

If you have any advice, please let me know. All help is greatly
appreciated.