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When Mia and Pio received their children from the stork, everything seemed fine.
...except for one detail.
While Luigi had taken to both of his parents just fine, and Mario had taken to Mia enthusiastically...
He completely rejected Pio.
They couldn't figure out why. Both Mia and Pio tried repeatedly to explain to Mario and show him that Pio was his father, but Mario seemed to vehemently deny this notion, and treated him like a fake.
It wouldn't be until years later, when the bros first started to talk, that their parents began to get a glimpse of what was really going on...
Pio had simply gone to pick Mario up one day, and he jumped away from him, and cried out. "MARIO WANT YOSHI!", and he somehow said YOSHI in the exact same voice as the Smash Bros Brawl announcer.
Both Mia and Pio reacted in shock.
"...Who the heck is Yoshi?" Pio asked, also in the exact same voice as the Smash Bros Brawl announcer. Just read every single mention of Yoshi's name in that voice from now on.
"DADDY!" Mario replied, and Pio's eyes bulged out of his head.
He slowly turned to his wife.
"Mia, did you FUCK-"
"NO YOU IDIOT" Mia yelled at Pio.
"Fuck?" Luigi babbled.
"DON'T SAY THAT" Mia yelled again.
"Hey, wait a second, Luigi, do YOU know who Yoshi is?" Pio asked.
Luigi stared up at his parents blankly, the gears slowly turning in his little head...
"Lizard?" He finally said.
"what"
"Bowser say Yoshi lizard."
"WHO IS BOWSER-" Pio began, before cutting himself off. "Okay, one thing at a time. Yoshi. I'll be back." Pio said, heading out of the front door.
He returned later, and approached Mario.
"Okay Mario... Is THIS" He began, pulling a lizard out from behind his back, and offering it to his son. "Yoshi?"
Mario looked at the lizard, and huffed. "NO! Yoshi have big nose and big eyes and saddle I ride on! That NOT Yoshi!"
Pio's eyebrow trailed higher and higher up his head until it was floating in the air.
"Mario, sweetie, could you draw Yoshi?" Mia said, offering him a red crayon and piece of paper.
Pio was about to praise his wife for the good idea, when Mario responded. "Yoshi green!"
"Okay, we'll get you a green crayon." Mia said, digging through the box of random crayons that they had not even remotely tried to keep ordered and had several missing because be honest we ALL had that right, and offered him the green crayon.
Mario got right to work, drawing up a storm, while his parents (and Luigi) watched from the sidelines.
Once Mario finished his drawing, he presented it, smiling proudly.
"Yoshi!" Luigi happily said, clapping.
"...is that a dinosaur." Pio flatly said, too bewildered to feel any emotion.
"It looks like it." Mia agreed, feeling similarly.
Just when they were about to maybe write it off as a weird imaginary friend thing (that Luigi somehow knew too), Mario continued.
"THIS Daddy!" He said, tapping at the drawing insistently. "He taught me this!"
Mario proceeded to jump up on the couch, and platform across the furniture, while his parents watched in horror.
Apparently Yoshi was very real, the storks somehow gave their child to a dinosaur before them, and said dinosaur taught their son parkour
"...can we sue the storks" Pio asked.
They proceeded to sue the storks.