Further affidavits and secondary evidence will be useful.

Best to consult with an attorney to explore the history & incident.

No there is nothing officially that needs to be done.

Yes this may but should apply for a reentry permit.

Yes this could come up the future applications but should be explained well.

That the intention requirement was not satisfied.

The adopted parents should be indicated.

Yes the spouse would also obtain GC with sibling.

You may change jobs whenever you like.

You may do so with SSA at this time.