Maybe he is related to the Strange man i dunno, perhaps it was his father or older brother.

If Josiah was the Strange Man, why didn't John recognize him?

They look slightly similar on account of Trelawny having similar facial hair and colouring, but that’s about it. They have a different voice, and what Equivalent mentioned is a very valid point.

I swear, comparing the two is like suggesting Jack is Javier or Dutch’s son because the have somewhat similar facial hair.

Oh well i was wrong

I'd like to thank everyone who participated in this poll for restoring my faith in this community. Well, more or less.