1. Will her H4 also be approved till Dec 2017? 2. Will her EAD be approved till Dec 2017 or EAD will be granted for 3 years?

The maximum for the H4 and EAD are the same as the H1b

If I petition my parents, can the petition be denied based on the fact that I overstayed my visa prior to becoming a citizen?

No your prior overstay does not have an impact on a resident petition from you for them. The likely reason that your parents are not being granted...

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Information regarding COS(H4 to F1)

A change of status from H-4 to F1 is possible. The place to start is with the school's designated school official as you need an I-20. Processing...

1. Will there be a issue as USCIS has two applications of mine(H4 to F1 and H4 to H1B). 2. Which status will have priority?

Normally the last decision determines status. Speak with your employers immigration attorney.

Will uscis accept the affidavit of support using her income ?

Does she have the 2 year home residency requirement? Are you a US citizen? A co-sponsor is required if income is insufficient.

My Questions are, Can I travel outside US when Amendments are in progress Will there be any problem during stamping if I travel

Possibly but before going speakin with the employer's immigration attorney that prepared the filings.

H1 petition transfer

You will need an approved petition and a visa issued

What best to do to be able to cross borders and visit each other often?

You may have issues in any scenario. if your travels to the US are less than 90 days the ESTA remains available but your will need to be able to...

Is there any possibility that I might have complications while coming back to USA? if yes, what are those?

There is always a possibility of refusal even with a valid visa. To make the best assessment discuss with an immigration attorney before departure...

When Exactly can I apply for US citizenship?

With three years of resident status and married and living with a US citizen spouse you may apply for naturalization 90 days before three years as...