You should be able to port if you have proof that the application was approved, including the online statement.

No. There is no immigrant visa category for parents of permanent residents.

CIS should consider the application filed by the deadline if it arrived at CIS before your card expired. Grounds for denial may be, for example,...

Perhaps separating by a page of colored paper would be best.

Any future application that the company, that you own, files for you, will get very careful scrutiny. And likely a denial.

Their status is H4 until USCIS determines that they are no longer in status.

No. Your income can be included on the 864 without any 864A.

If the I-485 is approved, you will not get a work permit. If not, if the I-765 is approved, you may get one. It should take two weeks or less.

You need an income of $135,275 to support a family of 22 [you and 21 dependents]. If you have no income, you can show savings of 5 times that...

The new rule is that there is an automatic six month extension. Not that a person can work so long as there is a pending application.