Is I-944 needed for each family member with I-485 application?

Yes, each living individual applying for I-485 needs to also attach and filled out I-944.

What are the risks for H4 to F1 visa transfer (Change of status) within USA?

There is no need to either change status to F-1 or apply for F-1 visa when one is already so lucky to be on H-4. Can enroll & study while on H-4.

No matter how many times you ask the same question, our answers will be the same.

When can I apply for citizenship if I have been to US for about 2 years now, but my husband just got his citizenship last month?

Either way you calculate it, the time needed to become eligible to apply for citizenship will amount to the same 3 years you need to wait.

Do i send another application?

Yes, you may send a second I-360 but by this time the damage must have already been done.

Regarding H1B- Extension Through I-140 along with (H4 + H4 EAD)

Either pose these questions to your attorney or else schedule a phone or Skype consultation with an independent lawyer for a second opinion.

Can I recover back wages during benching period for which I submitted leave letter?

An employment lawyer will not understand the rules that govern H-1B workers.

Clearly, it is the deliberate action on the part of the CBP officer which controls. The departure date is in June and parents need to apply for...

Let your DSO make that decision for you.

Yes, the petitioner can file the DS-260 on the applicant's behalf. You will need to follow the instructions for the signature.