You need to have the PAH’s permission to port the line since they basically own the number.

Thanks for your tesponse. What if I do not want the number/line any more. I am going to get another line for myself. I just want to leave both the family plan and line/phone number. So, I still need the PHA’s permission?

No, you can open a account on your own. Are you financing your current phone through your current plan?

I would inform him that you're opening a new plan and won't need the number on his plan though.