I've been in the USA for 31 years now trying to figure out how to get my citizenship, I don't want anything for free I want a jo

Analysis of your case must be made before advice can be given.

Yes this may possibly affect your naturalization application. Consult with an attorney for guidance.

You should consult and hire an attorney right away.

When would I send rfe response ?

For advice regarding what to send for an RFE, it is best to consult and work with an attorney.

Can my mum file for me?

Yes, she may petition for you however you would need to remain unmarried until the visa becomes available.

30(M), U.S. Citizen, desiring to marry and eventually obtain green card for 25(F) Chinese citizen, fiancé, on a tourist visa.

It is best to consult with an attorney to determine the best options available as there are many.

Will my 2.5 years marriage will make a dent on the waiting time?

No the length of time of your marriage will not make a difference in the processing. However you will likely receive a permanent resident card not...

Is a child a citizen of the USA under section 320 of INA (child citizenship act)?

Yes the child would have derived US citizenship through the mother becoming a citizen before the child turned 18.

It may take between 60 to 90 days for that at National Visa Center to process all of your documents.

Yes the individual and identifying alien number should be used consistently for the applicant and all applications for the government.