This is a Non-canon story where Chili and Bandit have biological children before Bluey and Bingo were born, Sandy Heeler and Indigo Heeler.
Sandy is 13 years old, is a big Brother and Indigo is 9 years old, is a second brother.
This story is taking...
Saturday evening. Max showed up at the Heeler front door with a duffel bag.
"G'day," he said when Sandy opened the door.
"Hey! Thought you weren't coming till tomorrow."
"Mum said tonight was better."
Sandy looked at the bag. Looked at Max. Max was doing the thing where he smiled but his eyes didn't match.
"Cool. Come in."
Chilli was in the kitchen. "Max! Hello, love. Have you eaten?"
"Yeah. Thanks, Chilli."
"There's leftover lasagna if you change your mind."
"Thanks."
He followed Sandy upstairs. In the spare bedroom, Sandy tossed a sleeping bag onto the floor next to the bottom bunk. "You're down here. Indigo's up top. Don't touch his stuff or he'll know."
"I won't touch anything."
"He'll still know."
This episode of Bluey is called:
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Indigo was on the top bunk, reading. He nodded at Max. "Hey."
"Hey, Indigo."
"Don't touch my stuff."
"Sandy told me."
"Good."
From down the hall, a stampede of small feet. Bluey appeared in the doorway.
"Max! You're here! We're playing Castle and you have to be the giant!"
"What?"
"CASTLE! In the living room! Dad's already the drawbridge! Come ON!" She grabbed his hand and pulled. Max was twice her size but let himself be dragged.
The living room had been transformed. The couch was the castle wall. The coffee table was the moat. Bandit was lying across the gap between the couch and the armchair, arms and legs spread, being the drawbridge.
"Evening, Max," Bandit said from his drawbridge position. "Fair warning—I've been lying here for twenty minutes and I can't feel my arms."
Bingo was on top of the couch-wall, holding a paper towel tube. "I'm the queen! And nobody gets in without the password!"
"What's the password?" Max asked.
"It changes every time," Sandy said. "That's the hard part."
"The password is..." Bingo thought very hard. "Spaghetti!"