Synonyms for blood brother

He was blood brother to my father, and cousin to my heroic uncles.

But since you've struck me, I'd do it if you were her own blood brother.

Toby took me up there, and they treated me as if I was their own blood brother.

Blood brother to the two kittens on the floor, Frosty was a third bigger than they.

They will do him no harm if he is willing to be their "blood brother."

How can Bausi give up Dogeetah who is his blood brother, and you, his friend?

And the doctor was made a blood brother of the chief, and learnt the secret of that medicine.

I have sat at tribal councils and been sworn a blood brother, and I have used the secret password to get knowledge in odd places.

The blood brother of the defense screen, its energies concentrated into a pencil of radiation.

He thinks that he is a blood brother to all living creatures, and the storm wind is to him a messenger of the "Great Mystery."