NOTE: NOT MY ART AND REPOSTED WITH PERMISSION. All credit goes to Taleea on DeviantArt for the original drawing.

From left to right: Rocco (father), Rex (toddler), Monster Kid aka MK aka Max, Goner Kid aka GK aka Gracie, Lydia (mother).

Look, everyone; look! A drawing of my depiction of MK's family! :D And it was all drawn by another user because my drawing skills still aren't all that great! Lol XD. But anyway, look! Visual representations of MK's father, Rocco (who made his debut in "Tickles of Justice"); his mother, Lydia (who made her debut in "Spooky Scary Funny Bone Ticklers"); and his baby brother, Rex (who still has yet to appear in one my stories)! :D They're drawn beautifully, right? And of course there's also MK himself and his kid sister, Goner Kid aka GK aka Gracie. One thing I haven't mentioned about Goner Kid in my stories yet: Her skin isn't always gray. Sometimes, her skin is the same shade of yellow as her mother or gray with a hint of yellow. The latter of which is shown in this commission pic. Thanks again to Taleea for drawing this for me. She did such a wonderful job, didn't she? X3 And if you're not already following her, feel free to give a her a follow. She has her own Undertale fan comic in addition to lots of other great Undertale fanart! "Mendertale" is the name of her comic and it's one of the more underrated UT comics imho.

Monster Kid, Goner Kid, and Undertale© Toby Fox.
Rocco, Lydia, and Rex belong to me.