I guess my very first question is, what do you possibly need to access on his iPhone that you can’t accomplish through a motion to a court and/or subpoena?

PS: you’re not getting into the iPhone. Even the one single time the FBI accomplished this through a private company, they paid that company millions for doing it

Go to the manufacturer website OP. You will find what you’re looking for there

Wow, interesting family dynamic. Thanksgiving should be fun