Some i-864 questions

[Hopeworld 1]

Hi guys...just a few questions. I'm sponsoring both my parents

1.

I have my parents police report where it shows they haven't committed any crime. But the date on it is 2 months ago. How long do I have to send all documents in before they say this document is too old and they need newer? Is it 3 months?

 

2.

 

I just gotta say it's really odd that I have to do an i-864 separately. The more I fill it out the more it seems very appropriate and possible to do a ONE i-864 for both parents. Do I really need to do it separately?  100%?

 

3.

It says I need:

 A Court Records with translation
  B  Military Records with translation
   C Police Certificate(s) with translation
  I have a a Criminal records for my parents.    Is this the same as policy records? I went to court they said they had nothing to give and I had to go and get a criminal records. They haven't been in military either.
Does this mean me having criminal records of my parents showing they have not committed any crime is all I need?

 

4.
I've done all things I need to do for their application now it's time for the i-864.

someone said "mail the stuff separately dont mail letters together with check"  . what does this mean?
I planned on sending BOTH i-864 for both parents and all in ONE envelope. I have to pay for each check so I was thinking of doing one big i-864. Is that ok?

Thank you so much for advance. Really appreciate any help.