How long do I have to stay in the US assuming that I went back there before my re entry permit expires?

We need more information to answer your question. It appears that you have a green card, is that correct?

What will be my steps if I want to apply for a US working visa from Canada?

Unless you are a Canadian citizen, your immigration options are the same as in Russia.

Will it be considered fraud if I apply for COS (B1/B2 to H1B) after 90 days of staying in the United States ?

No, if your stay in the US is 90 days or longer, there is no presumption of fraud.

Yes, she can adjust her status. To adjust her status from the US, the American citizen child must file Form I-485, Application to Register...

WHAT TYPE OF AFFIDAVIT OF SUPPORT FORM IS SUITABLE FOR ME TO FILL ?

You want to file the I-864. I suspect that you are trying to save money by doing the filing yourself. You should consider having a lawyer look...

Unclear information in N 400 for point 10?

At the interview, you can provide the correct details.

You will receive Form N-445, Notice of Naturalization Oath Ceremony. Make a copy of it and send the original Notice back to your local office...

Am I out of status?

You need to ask this question of your company attorney.

Do I need to go to the interview even when I know I have been aged out?

It is worth consulting a lawyer to make sure that you have aged out. The rules are complicated.

If he requests my greencard, once I am unemployed (i-130 petition)?

Your father, who is your sponsor, must meet certain income levels. You should consult with an experienced immigration lawyer to verify that he has...