Okay, he could be related to Ellie too.
Ellie doesn't usually bite though.
She just growls a lot.
Hopefully you find an answer because I need one also.
But for now when someone comes over I would suggest putting him in a room and shutting the door so nobody can pet him. If he bites the wrong person he would be in big trouble...
And you aren't the only one who gives raspberries.