Do I need to answer a child custody summons when a deficiency form was sent to the petitioner?

If you weren't properly served and didn't receive a petition, no you don't. However you should periodically check with Court administration to...

Can I get police indecent reports of domestic violence if my child was present?

Yes you are entitled to the police report. You should contact the relevant department re: their procedures.

How can I drop a OFP?

You can motion the Court to dismiss the OFP.

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He can start the divorce process and ask for an expedited motion to remove the new individual and possibly his wife.

What is the process of a order of protection?

You will be attending a full blown evidentiary hearing too argue for the order for protection against the other party.

You could motion for a modification of custody or parenting time based on the harm to the children. A GAL could be appointed as a third party. ...

How important is it for me to fight child support when they get the amount of overnights wrong?

In addition to what counsel said, you can check the monthly impact of that error by using the MNDHS child support calculator online.

Search public records in the state(s) where you think he was married.

Can 7 children with 5 different fathers live in a 4 bedroom town home with their mother and a new man?

Yes it's permissible. However, it may affect the Court's best interest analysis, particularly if you have a better living arrangement. Also, it's...

What right do I have as a father

I agree with Counsel. You have no rights until you establish them after the child is born. This would require starting a child custody matter...