Does my husband need to return to home country before filing his DS 260 as he is currently in US on tourist visa for vacation?

It doesn't matter where he is to file the DS-230 with NVC/US consulate.

An I-130 should have been filed two years ago. What in the world have you or your attorney been doing for the last two years? This entire case...

You have almost zero chance of getting a green card through EB-1. And, yes, you have sixty days to find a new H-1 position.

H4 to h1 change of status prior October?

You cannot transfer the H-1 status to Company B because you are not in H-1 status, and less you work for Company A after Oct 1, 2019 you will not...

Immigrating to the USA?

Unless you have an employment option you will have to wait until one of your children turns 21.

I-130 Application

If you get married that will end your Dad's case. The FB-2B category does not include married sons or daughters.

Dependent(H4) Out of Status, Need help.

Doesn't the attorney who is being paid to represent you know about this? It is very simple: your wife needs to leave immediately to get a new H-4...

I am on F1 visa, I entered the country on Dec 27, 2014. Am I exempt from social tax in 2019? Since it has been 5 calendar years.

This is actually not an immigration question. It should be directed to a CPA who is familiar with tax treaties between the US and foreign countries.

Is it advisable to reschedule the biometrics appointment?

This is a mistake by CIS which the attorney you are paying to represent you should be taking care of.

H1b and green card application?

I assume your immigration attorney could help you with this. If you file the marriage case and leave the US without your travel permit, the entire...