If they are close friends, then remember not to quench their spirit. However, do test them.
Tell them why you believe that only Catholic priests can do so. There is a verse about the laying on of hands of the presbytery which is how tbis gict is passed down.
1 Timothy 4:14
Neglect not the gift that is in thee, which was given thee by prophecy, with the laying on of the hands of the presbytery.
Then listen to their answer. Then tell them why you believe in the Catholic Church. I like to use Matt 28:18-20 to support that.
I forgot. First pray for them. And after that, study and pray for them again.