I'll bite for a second. Lois has had Lucy Lane as a sister, and whoever Susie Thompkins' mom is as a possible "very in limbo" sister of some variety, but just historically, ever, has she had a brother? In any media, mentioned off-hand as "ugh you're more annoying than my brother" or anything like that? Not that I know of. It's always a sister, and a very continuity-flexible sister/brother-in-law situation with a niece, and then a couple cousins of varying reknown.
But I mean, I'll just throw it out there. I like pulp, I like schlock, and I like soap operatics. But Nightwing has a Sister and now Lois Lane has a Brother? DC Writers are officially out of ideas.