Would this be considered an "extended" family?
Me & my best friend have been friends for 5 years now. We have a very close friendship, we hang out almost all the time. He's older than me so he's also very protective of me like I'm his little brother. I don't have a brother, & while I love my sisters very much & not replacing any of them, I consider him the brother I never had he cares about my sisters as well. He has 4 kids, 3 daughters & 1 son. The 3 girls were already born when I met him but I was there when his son was born. But they all call me Uncle since they see me & their father are best friends, & I consider them my nieces & nephew. He told me I'm one of the few people he trusts with his kids. It may seem a bit weird & but we're all like an extended family. Is this normal, or are we considered too close?