Wiktionary
brotherless
a. Without a brother.
Usage examples of "brotherless".
For I had been revolving many plans, which had one sole aim and object, to keep near me this lad, whose companionship and help seemed to me, brotherless, sisterless, and friendless as I was, the very thing that would give me an interest in life, or, at least, make it drag on less wearily.
Yet will I nevermore be wholly brotherless, having worked in the relays which touch mind to mind all over this world.
I am alone, brotherless, friendless, alone against the Comyn who hate me, and there is none to stand by my side.
And it takes one big rock, Sirany Tauran, one C-charged rock, and we're all widows and brotherless.