You can check with the nearest SS local office. If you are not eligible for a SS number, check with a CPA on how to obtain a Tax ID nr.

If my green card was changed to a multiple visa, but i am thinking of moving to the US, can it be changed back to a green card?

Probably you will need to reapply to get a green card for you and your family members. Consult an immigration attorney to discuss the options...

Can a U.S. Permanent resident(green card holder) give affidavit support for i-864?

Yes, a LPR can submit an I-864 as a cosponsor. Follow the instructions on the I-864 on what to submit in support.

Question of the fee bill(s) for the affidavit of support in the immigration cases of my husband and his two sons of 11, 13 years

You can pay the fee on line. Follow the instructions on NVC correspondence. When you log in to your case you will see what fees you are supposed to...

Question RE what additional documents to bring to embassy visa interview...

Make sure you bring the documents NVC and the embassy has requested. The rest, bring with you just in case you are asked to provide them.

Can overstays F1 use their SSN ( valid only for work with DHS authorization ) to file taxes ?

Ask a CPA or a Licensed Tax preparer regarding the SS nr. Consult an immigration attorney regarding any immigration options available to you.

Submitting I-94 printed out from CBP website in place of the actual paper I-94 card for H1b visa application.

The name can be corrected at the nearest CBP Deferred Inspection office. After doing that you can reprint the I-94 and submit it for the H-1...

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What issue's am I going to run into by moving back to Canada from the U.S. after 25 years of living in the U.S. ?

It would be best to naturalize in the US just in case you decide to return to the US in the future. Bering a Green Card holder and remaining in...

What to bring to the interview? post i601 approval

You will be contacted by the embassy with what you need to provide at your next interview. Congrats on the I-601 approval.

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J2 visa

Consult an immigration attorney near you. Find one here on AVVO. Some even provide free consultations.