My son was diagnosed with severe mastoiditis on november 5, operation was due on 26 february , he sadly died of meningitus on 8 february , any connection?

Difficult question: I am sorry for your loss. Your question is complicated and i don't have enough detail to answer precisely. However, in acute mastoiditis, the infection can travel outside of the mastoid space and one of the possible complications of the spread is meningitis. Therefore, without knowing more about your son's specific case, the answer is that there may be a connection.

Probably: The mastoid is very close to the brain. Likely.