i have a dumb question how big is the age gap?

Dunno but the deer is clearly his parents' age so...

I heared Yullur was actually inlove with the mother soooooo yeah….

There's a prequel about the story of you wanna check it out

Yullur is exactly Zeth’s (dad) age as they were childhood friends and ex fiancés. They’re both older than Louie (mom). And now you have Saya….the child of those two…falling in love w the man who used to love his mother. This is like Jacob and Renesmee from Twilight all over again(╯°Д °)╯╧╧

Well Yullur watched over Saya since he was a baby so yeah, its pretty big