For Everyone Who's Left Me

How would you feel if you were the only existing people of your family?
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5 Siblings:
Lauren-{Age:17The Brains/The Smart Blonde
Cara-{Age:17}The Brains
Noelle-{Age:16}The Hardworking/Curious One
Adeline-{Age:15The Happiness
Alexander-{Age:14}The Lazyness
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1 Hard Life...
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Everyone in their family died in one vacation. The only person they had left was their crazy Uncle Jack. They never really counted him as a family member. On that one vacation, it was believed that an earthquake had happened unexpectedly.
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One day as Alexander snuck into their uncle's mansion, he found a journal with one page written by their uncle.
"I'll never forget the day where all the people that I loved died. All except for five whom I must protect. I believe that it wasn't an earthquake. It's rather something mysterious. Like a murder almost. Sure there was an earthquake, but it was never that strong..."
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The next day, Adeline snuck in and found a scroll in the mansion. It had a phrophecy.
"Seven days are spared,
For those who seek
The one mystery,
Though only five
Shall Succeed."
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Later that day, Noelle snuck in. There were so many suspicious things that mansion, that she wanted to take a look for herself. From there, she took home two daggers, one sword, a bow some arrows, a gold knife, and throwing knives.
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After reading so many other things, and sneaking in some more, they were caught. Their uncle explained a lot of things. The siblings were convinced to trust him. There uncle told them to do the research in the city and some on the internet. He would go to the place where everyone died as soon as they got enough research done.
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Will they be able to solve the mystery in seven days?