Ok... Just to clear this up before I start the story, when I said Grace was a year younger than Scott and Stiles, I mean they're still in the same grade.
You know if your friend was born in... Let's say 1998 and you were born in 1999, you're still in the same grade... Right?
So that means Stiles and Grace were born in the same month but different years. I don't know how Mama Stilinski did it... But she did.
I hope that clears it up a little bit. Sorry if there was any confusion. Comment I you're still a little confused.
I'll update later!!!

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The Other Stilinski
FanfictionGrace Stilinski, younger sister of Stiles Stilinski, and daughter of the Sheriff. She's one year younger than Stiles and Scott but acts like she's older than them. She's VERY shy and doesn't talk much. Shocker huh? A Stilinski to shy to even look up...