When the visa is available, she can be issued the visa and immigrate to the U.S. There is no visa that lets a person come to the U.S. to try to...

You can include in the family size yourself, your spouse, your other dependents, the other people your wife sponsored, and the two children. Then...

You can send it before, together, or after.

No, it is over six years since you were approved and you state that you have not used the visa.

You can check your priority date at https://www.uscis.gov/visabulletininfo

Unless you agreed in advance to reimburse them, they cannot force you to pay. Yes, you did cause them to lose money they paid, trusting you would...

Right. Generally DHS requires proof of who is taking responsibility for the individual.

Actually there is a different petition one does for naturalization, not a mandamus. But mandamus would work for the I-751.

It depends on the crime. He may not be able to sponsor you. Even if he can, he may need to get fingerprinted. And he may not be able to show up...

You can report her to DHS. The police do not enforce immigration laws.