User blog comment:MaverickGuy720/The Whole Luna guardian situation..../@comment-31022739-20170802004427

No one is Lincoln's guardian. No one. Much like "Lincoln is adopted", "mean/nice" sisters, and Lincoln's "black sheep status", it's nothing more than headcanon that some fans imbue with more worth than it actually has, to the point where they believe the show fosters their contrivances as an actual part of the canon.