My Brother Living So Far Away

I’m 14. I have 13 sisters and 1 brother. I’m really close to my brother, but he lives really far from me and I haven’t seen him in a year and I miss him. I’m really worried about him, too, because I haven’t talked to him in two months and my mom has been calling him a lot and he’s not answering. She tried calling his dad. He answers, but says to stop calling and hangs up. Wow. How do I know he’s okay?