Why does god let this happen?

I keep hearing "everyrhing happens for a reason for gods plan". This may sound confusing.....my husbands sister lost her father 3 days ago to a heart attack. The next day my husbands uncles house burned to the ground losing EVERYTHING. Including 3 dogs. my husbands 7 yr old nephew ( husbands uncles grandson)accidently caused the fire. This morning the 7 yr olds father (husbands cousin) was found dead in his sleep. Most likely everyone is suspecting he overdosed on cocaine. I know it was wrong of him and his fault but he left behind his little boy and wife....to no home to go to since his parents house was burned down. Why would god allow so much tragedy and heartache w in 4 days. His family is devastated. They lost their faith and now I feel the only sane person to help them out. I dont know what to do. We live in ga and are flying out to texas at 3am