how to deal with grief?

Sorry if this is in the wrong place... really needing some advice. 
Something extremely tragic happened in my boyfriends side of the family related to suicide. I don't want to get into what exactly happened.
I have never lost a family member before so I don't know how to help him cope or what to do/say? I don't know how to make him feel better. The family member is not dead but it was an attempted suicide. He was extremely close to this person.
Any advice? I am so new to this.. thank you..