Your sister can petition you, however depending on your country of birth and visa category, you'll need to wait till you can file for your green...

Usually, DMVs require immigration paperwork like work permits and passport. You'll need to contact your DMV and ask them to confirm the paperwork....

If you applied in the US, its probably the state you were living in. If you applied outside US, it will be the embassy that did you interview. If...

I recommend talking to an immigration attorney either before your dad attend the interview or after he visits US. There are a lot of red flags...

As long as you mailed it to the correct address, and it was delivered. It should be fine.

If you have been counted towards lottery, you do not have to apply for it again. You'll need to be re-admitted as an H-1b holder. I recommend...

You can. You'll need to do a change of status. However, I recommend getting professional help because there are a lot of rules and regulations that...

I recommend talking to an attorney before you get married.

You certainly can. However, if possible, have an attorney review your paperwork before you file to decrease the chances of rejection or denial.

I agree with my colleagues. Visitor visa might be the best option at this point.