[@DragonKingUk] I find it very hard to imagine adding another sibling to the church secrecy history part. First of all it has to be a twin if it came from the same mother. But sure you can play one, although tell me what you have in mind first, about his/her bio.

Maybe they could have a telepathic link so she knows what he is thinking and vice versa.

[@The One] He will be using signs but the basic ones that even a doofus could understand. Maybe I could add minor telepathic powers to his ability list which convey a hint to his intentions.  
Well he won't be one for conversations LOL, he will mostly listen.