My headcanon for goggles and his family life go like this
He was born with a twin brother named Pilot and a little brother named Gogo.
Gogo is 2 years younger than his brothers
He lived with his mother and his grandmother. His father went missing before Gogo was born.
It's unknown if his father left, died, or just disappeared, but his absence didn't affect him or his brothers
Pilot is smart academically, Goggles has social smarts, and Gogo is average in both.
Goggles is older than Pilot by 2 minutes
Pilot doesn't care for turf wars and would rather study, but he's jealous of goggles and his ability to make friends so easy.
Goggles is jealous of how smart Pilot is and how good he was in school, because the only class goggles was good in was Science.
Gogo is studying abroad in Osaka, so he barely ever sees his brothers (I also headcanon that Inkopolis is somewhere in New York)
Pilot is a pretty chill guy, but he has anger issues.That's it for now.

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