Animation designer Andry Rajoelina has created an uplifting, and occasionally funny, series of prints featuring the families of superheroes. That's "family" as in Superman Family, not as in Jonathan, Martha and Clark Kent. The first set was focused on DC, but he's now done a second group with Marvel characters.
Some of the characters, but not all, are biologically related, and that's part of what makes the series so heart-warming. One of the nicest, most reassuring messages of the X-Men was always that people without families could form their own. (I've always loved the idea of the X-Men as a family much more than the idea of them as a school.) Rajoelina's two series highlight that. They focus on adult/child relationships (the Fantastic Four leaves out Johnny Storm and Ben Grimm, for example), but Rajoelina is able to figure out a workaround for Green Lantern, even if it's a little sad in a humorous way.
Prints of the Justice Families series can be purchased at the Geek Art Store.