Your's and Nolans moms have known each other since they were kids. So when they ended up having kids, you guys grew up together. Of course Nolans family had a beach house you all stayed at too during summer

Nolan had an older brother and so did you, You and Nolan were only months apart in age.

Late one night you tried to sleep, but failed, so you did what you and Nolan always did. You tapped on the wall of your room, and he tapped back