pushbrk

It is allowed, but not everybody has the aptitude, attention to detail, and motivation etc. necessary to do it themselves. Many do, but many don't.

Correct, and the 5 year bar still stands. He's at least 3 years from a visa.

Not actually false. Your statement above IS false. Truth is that neither the petitioner or joint sponsor need to "submit" three years of tax returns. They both need to provide INFORMATION FROM three tax returns and submit only the latest. Further, the joint sponsor has MORE required supporting documentation than the petitioner, in that they must document their status in the USA and that they currently reside in the USA.

1 Yes 2 Tell them the truth about the business trip. That is your primary purpose. You are no more obligated to mention a wedding (even yours) will be one item on your agenda, any more than you are required to mention you will visit a public library. There's nothing wrong with marrying and leaving, but it is not necessary to mention either.

Yes, 300k USD in cash will do nicely for your wife and even three or four children. State your income in the tax section by entering the number on the "Total Income" line of your past three tax returns. You will get a notice "suggesting" that you "MAY" want to use a joint sponsor. Just ignore that message. You are a self employed investor, in the present tense, so your job offer is meaningless. If you want to use the income from a future job, go start working now, so you can state the full 70k as your current income. You do not "estimate" but if your salary is 70k that's your current income. (again, only if you are actually working at that job presently) Presumably you have other assets producing investment income. State and document those assets too. It's time to become an A-Student of the I-864 and it's separate instructions. You are at NVC. Your wife is still a few months away from a visa.

No negative repercussions for leaving it off the affidavit of support.

Yes, in which case they use their pension award letters as evidence of current income. They count all the income sources, even if some are not taxable.

Same answer

Agree that is the problem. However, this is just a note. If you cannot correct the DS 260, simply ignore the note. The children need their US passports only.

Scan and email the documents to her. Marriage certificate is what is needed. Sometimes a marriage license and certificate are on the same page, but they are not the same thing. Marriage license is before marriage. Marriage certificate is after.

I-864a is not needed from the foreign spouse, under any circumstances. Become an A-Student of the I-864 instructions before completing the form.

Yes, 40k USD would probably carry the day. I would provide five statements. One from a year before, 9 months, 6 months, 3 months and one current.

After that, you wait for a response. Google the email address.

Your liquid assets can be used. Since this would no longer be your primary residence, once you're in the USA, then yes it "could be" considered liquid. Liquid assets like savings are treated much better. The savings would need to be 3 times the income shortfall, technically, but they will consider the thousands you'll spend relocating will NOT be available to support you, so much more is better. Best scenario, is sell the house in the next year BEFORE submitting the I-864.