Fundy and you were both siblings, your dad being Wilbur. Fundy hated you with his guts cause he felt like Wilbur favored you more over him and this caused him to always be rude and aggressive towards you

Fundy: Dad can we go home already I’m bored!

Wilbur: Fundy be patient like your brother/or sister. We’ll be home in a few minutes alright. Fundy glares at you Fundy: whatever…