I Think Life Is Unfair But I Have To Get Over It

I lost my mom when she was 55, my sister when she was 37, and recently my dad at age 79. My moms twin sister is still alive and had 7 kids, one has passed, and a husband. When we get together for family functions, I can't help but think its not fair that only one person in their has died and all I have left is a brother who lives cross the country. I feel bad for thinking this, but none of them seam thankful that they still have most of their family still here.
The only good that I see in this is my family is in a better place, and I will only have to go through 1 more death.