Which state was he claiming to have taken residence in at the first of the year?We were just in Michigan court and they asked him of his address and he gave the Ohio address and today in Ohio court he said that he took residency at the first of the year but gave Michigan court the Ohio address instead of using the Michigan address. He claims that he moves around alot and that he just uses his mom's address as a mailing address. The Magistrate even stated that a resident address is where you live - not a mailing address.
Where does he file as residency for his federal taxes? To which state does he pay state taxes to?
his employment: what state is used at his place of employment? WHich states taxes are being withheld?
You can obtain transcripts of the court proceedings to use at the other states court. This can also put him in jeopardy of perjury or possibly contempt. It could be used to bring doubt to his credibility as well.

