My 7yo just lost his grandmother and I don't know how to help him through his first death

My ex husbands grandmother just passed away over the weekend. Our two boys and her were incredibly close, and losing her is devastating even for me. My 5 year old isn't taking it as hard, but my 7 year old is absolutely crushed. He is heartbroken over losing his best friend and I don't know how to help him through it. How do I handle this? via /r/Parenting http://ift.tt/2Hze2U6