Status changing of B1/B2 visa

Did you file an I485/i130/i131 and i765 concurrently?

HI, if petition i-130 file from green card holder for his unmarried child before child's age 21,can child's age freeze?

Your question isn't very clear. Further, more info is needed. You should consult with a experienced immigration attorney.

If you are a US citizen, approximately 12 years.

For whom should I petition first, my brother or mother?

Both at the same time.

When can I file I- 485?

You should wait until August.

If I file for a sibling how long does it take. I understand it could depend on what country you come from. We are from Zimbabwe

You're looking at about 12 years. If he's in the US that does not speed it up and he must maintain lawful status the entire time he is here.

I filed my husband i130 then uscis sent intend to deny because he was married on his nonimmigrant visa they ask us to send a

You must hire an attorney to sort this out. Hope is not lost, but you are incapable of handling this on your own.

CAN SOMEONE WHO IS GOING TO BE MY SPONSOR (affidavit of support) FAX THE SIGNED I-864 FORM OR THE N.V.C. WON'T ACCEPT THAT?

No. They need an original signature along with a copy of all supporting documents.

Filed I 130 for my husband. I am a USC. My file is at mount laurel and has been there since feb 25 2013. So long? Going 6 months

That's rather typical.

How can I know if my case falls under a petty offense exception if I'm not in us anymore and want to get a non immigrant visa ?

Best way: hire an attorney to figure it out for you.