US Immigration from Philippines

https://www.philstar.com/headlines/2021/07/27/2115600/we-are-surge-octa-calls-lockdowns-metro-manila-cases-rise

My wife and I sent in our form I-751 in Dec. 2019 for a permanent green card. Our conditional Green card was extended for 18 months. That 18 months expires next month on Aug. 23. Today we received a letter requesting more evidence. Our new evidence must be submitted before October 18th.

Some of the evidence we cannot supply, such as evidence of children or leases.

I did not send them a copy of the marriage certificate with the I-751 application because I had already sent them a copy earlier. Now they are requesting another copy. The IRA beneficiary form I sent was not dated.

I plan to send them what I can. I have 3 questions.

1) The green card 18 month extension will expire on Aug. 23. The submission deadline for the new evidence is Oct. 18. My wife will not have valid green card between Aug. 23 and Oct. 18 and while I am waiting for a response from USCIS?

2) What do they mean when they say" Include duplicate copies if you are requesting consular notification"?

3) They sent a tiny return envelope . There is no way I can use it to send the evidence. I will have a lot of papers and will require a large envelope.

I appreciate any advice while I work on gathering these documents for evidence. Thanks...

I am a US Citizen from the Philippines, just had a baby and child care around here is almost impossible. Looking for sometime of online job like customer service or anything that would allow me to work from home.

To bring mother from the Philippines to the USA. Do I ONLY need to file the I-30 for her to actually receive the visa to come here? Then later file the I485 so that she can work or do they both have to be filed before she is allowed to come here?

OK, This is Ruby's MIL and I am doing the I864s. I thought I was fairly smart until I tried doing these. So I need to fill 1 out for each person, but what should family size be on each? Counting me, as I will be living with them, household size is 7. I also will do an I864a for each of them, as my son's income may drop upon return to the states from an overseas job. Which brings up another problem, most of my son's income is tax-free so his adjusted gross is often 0 how is this explained? Gracias