Damn! My 12yo will be 13 in May and his Dr said no signs yet, which is fine by me lol. He's half an inch short of 5' as of the 1st. My brother shot up 10 or more inches the summer between 7th and 8th grade so I'm just waiting for the shoe to drop. I'm 5'8" and the boys' bio dad is just under 6', but my dad and brother are both 6'4" and my sister is just a hair shorter than my brother. I'm gonna assume they're both going to be decently tall. I can't remember how tall #3s bio dad is, I think he was around my height, but I know his sister was barely 5' so time will tell with her. She's lanky though, all legs like me so she may end up being fairly tall. I'm hoping for her sake she stays in the 5'6"-5'8" range just because that's like the "ideal" height for ballet and as of right now that's what she wants to do with her life lol.