foster brother

I was his foster-brother and playfellow, unequal as was our rank.

But he kept off lawyers—and he sought out the only man he could remember—his foster-brother, Harborough.

Myself have seen and known even a baby envious; it could not speak, yet it turned pale and looked bitterly on its foster-brother.

Now, the Prince had a foster-brother who was a very wicked man.