Nil Fyodorovich Filatov (Russian: Нил Фёдорович Филатов , 2 June [O.S. 21 May] 1847 , or 16 April [O.S. 4 April] 1847 , – 8 February [O.S. 26 January] 1902 ) was a physician who is considered the founder of Russian paediatrics. His nephew Vladimir Filatov was a prominent ophthalmologist.

Can we draw the following conclusion?
Vladimir Filatov's father was Nil Fyodorovich Filatov's brother.
It's impossible to say