How long does it take USCIS to process the petition of an unmarried son/daughter of a non citizen who is marrying a U.S citizen?

First of all you father has to be granted the status then can apply for you. You are going to be in category F2B which under current trend takes...

K2 adjustment after k1 AOS approved

K1 only applies for AOS and no need for I-130 , if you are approved, you are good to go. I think K2 cannot adjust . You may file I-130 for her and...

Is there an immigration visa for cancer patients and their families?

It is a real issue, I urge you to consult with an attorney to avoid surprises.

What can I do to get an interview date and why is it taking that long?

You should get an INFOPASS and go to the USCIS office and inquire about it. Sometimes it is because of background check.

USCIS OFFICES

Perhaps the one in 703 Market St, San Francisco, CA 94103. Double check with USCIS.

How can my Dad work in US if I'm holding a US green card through marriage?

Your father cannot work in U.S. unless you become USC. Please be noted that unauthorized employment has some irreparable consequences.

Applying I-485 Does EAD/GC automatically changes f1 to changed status?

After adjustment your status will be changed and no longer would be held as F1.

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Do you think that this will cause rejection at the visa interview? or What will the CO do with me at the interview ?

YEs, you first have to be qualified under the law in order to be eligible for a visa, officer will not issue a visa for you until you fulfill the 2...

What can I derive from the above? Do you think the lady could report the applicant for overstaying even with extension filing?

I do not think whether they really do that. But better to find out about your case with your attorney. At least Mailing receipt to see whether it...

Is mediation required? Can I file chg of custody without an attorney?

In most of domestic disputes mediation is required, but it depends on the state where you live. My colleague answers your question more in detail...