I found the GriefShare program (13 weeks) to be helpful. There were participants who had lots spouses, parents, grandparents, children, and friends. It was nice to talk with people in person who "get it" and I've kept in touch with a few people after the program ended.
I was super close to my Gram, too, and I still think about calling her every once in a while. She passed from cancer in 2002 and I miss her like it was yesterday. She taught me everything I know about baking and sewing and we spent a lot of time talking on the phone over the years.