Separated parents: What do I do?

Update:

I have mailed in the documents requested (rental agreement, utilities, etc) and as expected, I was still requested to send in my NCP rental agreement, utilities, and W2s and a legal separation document. I was told that I could have my mom write a letter stating they are separated and living apart and get it notarized by a notary so I will do that. But I’m not sure how to write this letter. What do I say? Just “my parents are separated The End”? I’m a little lost and my mom’s written English is not well enough for her to do it herself.

Thanks in advance