Your father and any other JW is in cahoots with this elder that's been after you. You'll have to develop your own strategy.
I feel your pain. As a considered 'spiritual weakling', I have my share of friends and relatives JWs always trying to encourage me to do better spiritually; always asking me to go with them out on service. I always manage to turn them down some way.
During the most recent incident, a group of them was giving me unsolicited advice on how to increase my service hours. I told them ever so politely, with a mild smile on my face that turning in anymore hours than what I already did wasn't my interest at this time. I said that perhaps when I retire from working I'll try to renew the love I once felt for the religion.
You all should've seen the faces of them all. It was priceless!!!
DY