A Streak of Bad Coincidences?

I received some absolutely awful news tonight. My older sister, who lives in Florida with her husband, was in a car accident. I don't believe in luck, but if I did I would think that our family was having a very unlucky year! In August, my fiance and myself were in a car accident and both very badly injured. Six months later, we are still desperately striving towards normalcy in our lives. Our injuries are mostly healed- more so for Travis than myself, but our lives are still in shambles. In January, my younger brother (22 years old) was doing a transport for work in a company vehicle. He was tired from working multiple shifts back to back and mistakingly pulled out into an intersection while the light was red. He totaled the vehicle and hurt his back. On the 14th of February, my younger sister (18 years old) was on her way home with her fiance, when another driver hit a patch of ice and hit their vehicle head-on. All involved escaped with only minor injuries. And now, this news from my eldest sibling, Mary (27 years old). Like I said, I do not believe in luck. What I do believe is meaning behind coincidences. Four totaled cars in 6 months is a huge string of coincidences. I hate to read too much into this, but I notice an indeniable pattern here. It's like A.C. Clarke said, "Twice is a coincidence, thrice is a pattern." So, what is the key to this pattern, then? Add into the mix, my parents' house fire and it seems that we are all being tested. Lets hope that we can pass.