Answer:
You must keep this thing. Its loss will affect your brothers. For once yours is lost, it will soon be lost by others.
I wear a red robe, with staff in hand, and a stone in my throat.
The itsy bitsy teeny weeny yellow polka dot variety is quite popular.
A seed am I, three letters make my name. Take away two and I still sound the same.
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.
What do angels sing in the shower?