Then I don't see any issues. You make more than enough money to sponsor each of them. So as to your 2nd and 3rd questions, you don't have to worry.
As to your 1st question, there process is here:
After you file the I-130, the next step after approval is that USCIS will transfer the case to the National Visa Center (NVC). Then a few months later you will get a letter asking for some fees to be paid, around $400 for an I-864 Affidavit of Support and then $70 for biometrics. Once you pay that, then you will get another letter asking to fill out an I-864, provide supporting evidence, and submit other documentation listed on the letter. Once you send all of that in, they will forward the file to the U.S. Embassy or Consulate nearest to your father and they will schedule him for an interview. If that goes well, then he will get an immigrant visa to come to the U.S. and when he enters, they will give him a new Residency in the mail. The process should take around a year or so. It may take a little less. There is no reasonable way to speed it up, but you can try. Here is a link:
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Here is a link:
$23,862 or more per year. Please let me know if you have any additional questions and please do not forget to click accept. Thank you.
If he is still legally in the U.S. under A-2, I would just marry and then wait until you start living together to make things easier. If not, then you better have some very good explanations as to why you are not living together and lots of evidence of flights, buses, etc. to see each other.
And yes, that's what the minimum is. You aren't supposed to support them, but you are supposed to show that you have enough money so that just in case they cannot support themselves, you can support them if you have to. Please let me know if you have any additional questions and please do not forget to click accept. Thank you.
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