This is after what happened in the Sonic 3 Movie. . .

Sonic was watching a movie in the living room, eating a bowl of popcorn. The movie he was specifically Lilo & Stitch. Tails was also watching the movie with Sonic, but he was sitting on the floor, his tails slowly wagging.

Maddie was fixing up Knuckles a bowl of grapes, as Knuckles sits at the table, patiently. Shadow was looking out of the window in the living room. Knuckles: “Thank you, ma’am…” Maddie: “You’re welcome Knuckles.”

Tom walked out from his and Maddie’s room, saying loud-out. Tom: “Good morning family!” Sonic: “Hey Tom!”