Is it normal to have these thoughts?

So, this requires some backstory.

Two years ago (give or take a month) my uncle died from cancer. Following that, my grandfather died from cancer, my cousins son (a toddler) was beaten to death, then a friend died in a car accident, another from suicide, my grandmother from cancer, my sister's father from suicide, my friend and her unborn child from an aneurysm, my cousins from suicide, my aunt from a seizure, and another friend died in a car accident. Aside from lots of crying, I made it through all of those fairly well.

Then, my sixteen year old cousin hung himself in his closet this past thanksgiving weekend. This is the one that's killing me inside, and only since this happened have I been having thoughts of suicide myself. They're fleeting, but on bad days, or even just in bad moments, I find myself thinking "if he could do it, so can I." I haven't made any attempts, and I have plenty of reason to carry on so I don't plan on screwing that up, but I'm sincerely wondering if this is normal. We weren't overly close, but I think about doing it exactly as he did.

Is it normal? Part of the grieving process?