My sisters getting a divorce:(?

ok so this sounds stupid but its means alot to me because my sister got married when i was 5, and ive known the guy since i was 3 so its like having a brother! and now its like really loosing my big brother, im 14 so weve been close for 11 years and im really sad about it because im used to having both of them there for me because i really love them and im really sad right now:( how can i handle this better besides being all sad!? and how do i get unattached to him, its not like a brother in law relationship its more then that because weve been "brother and sister" for 11 out of 14 years of my life! should i be sad? thanks everyone..