Quote from Lily in Who Wants To Be A Godparent
Future Ted: [v.o.] And Lily and Marshall finally decided on a guardian. Marshall: Are you sure about this, baby? Lily: Yes. No matter what happens, I want Marvin to stay in the family. [The camera pans over the document which lists Ted Mosby + Robin Scherbatsky + Barney Stinson as legal guardians]