In the NYT Sunday Review 5/3/15, in “What Black Moms Know” by Yvonda Gault Caviness:
Thankfully, I am a black mom. Like many of my fellow sisters, I don’t have time for all that foolishness [about child-rearing].
I stumbled a bit on fellow sisters, though I understood that it was in no way contradictory; fellow here does not refer to a man or men, but to someone “sharing a particular activity, quality, or condition with someone or something: they urged the troops not to fire on their fellow citizens” (NOAD2). Still, the noun fellow is surely most frequently used for informal reference to a man or boy (there’s a fellow at the door), and this use can interfere with the (gender-neutral) ‘someone sharing an attribute’ use.