Maybe we need to examine the role of the male hero in a "family" to understand a female hero's. The male hero is often a patriarch, either an older brother or cousin, a father, or a husband. Even a character without blood ties or marriage bands to the male hero will be a daughter (Batgirl is Commissioner Gordon's), though some have no real relationship except the name (Spider-Woman, Batwoman) just leaching a popular name to sell books. In any case, it makes them beholden to the male character. Now reverse it. A female hero at the center of a family would have to be a matriarch, surrounding herself with younger male heroes. Well, we already know our society (absurdly) looks down on this. They would have to be older sisters and mothers, though the gender politics gets fuzzy if we make them wives. I love strong women, which is why I love a lot of superheroines, but we seem well away from the husband who will take on his wife's mantle.
Maybe the superheroine is a victim of history. Though Pat Savage predates her by seven years, I think Hawkgirl (1941) is really the first female counterpart in superhero comic books, and I wish I could say it was a case of her and Hawkman premiering together as partners (as they did in their first Silver Age appearance). But no, Shiera is just a girlfriend for the Hawkman's first four appearances. Mary Marvel was in 1942. As more female derivations of established heroes appeared, mostly through the Silver Age, the era's innate sexism may have held back any chance of a potable Wonder Man, male Black Canary or Sir Phantom. Traditions are hard to break, and the industry's sexism didn't end with the 60s. It would take a while for a latter-day heroine to become prominent enough to support a "family" and a male counterpart, and most of the original heroines are part of teams (Storm, the Invisible Woman, etc.) and have their own families, constructed very differently.
Which doesn't prevent us from loving our superheroines, sometimes more than the male originals! But what do YOU think?