I am currently on H1-B visa (valid until Dec 2021) and my Priority date is May 15, 2010, in EB2. I am working for employer A and I have recently applied for I-485/AOS in Oct 2020. Both EAD/AP are not approved yet and haven't received biometrics notice yet from USCIS. Kindly see below questions and advise.<br>

1) If I change to employer B after 180 days of filing I-485, how would USCIS know that I changed my employer if I do not file new I-485 J that's given by employer B?
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2 After getting EAD, can I stay without working for a few months? Is there a regulation that says that employment based I-485 applicant needs to work continuously after obtaining EAD?
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3) I am working for a consultancy company and recently changed my client who is not within 50-mile radius of the existing MSA. My current employer A is not planning to file H1-B amendment. In this case, if there is a site visit by USCIS officer and if they revoke H1-B, then am I still considered to be in legal status because I already applied for I-485 in Oct 2020? Am I safe to stay legally in USA in this scenario even though I did not receive EAD based on AOS?
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4) If H1B amendment/extension of an employee gets denied after filing AOS/I-485, is the employee still considered as in-status because of pending I-485?

I am working for an S/W company, I have an 8 years Old Daughter who was born in India, I am having EB3 /priority data in July 2016, My question is, How can I ensure my child remain in the US after 21?