I hope nobody died, but in that case you have my heartfelt sympathy! Do not think about the money now. Stay with your family and ignore that you have a little more cash in your bank account for a while. Take care!
I agree with @mattgerboth, but I'd invest things first in order to raise the health and living quality of myself and my family to normal (no luxury).
This part is up to you, but I'd save 40-50% in order to buy the stuff required that you need after you've bought that 0.5-1mm$ company for half of it's price (everything is possible with hard work, don't just accept the first offer blindly). When you know that the company is making profit, just help the company manage itself, because too much management is what usually makes things worse. You could also hire somebody who is knowledgeable in that area unlike those SAP Business Analytics bullshitters...
Regarding family. You've not told anything about it or yourself. Don't you care to let us know about it, or do you want to remain as incognito as possible?