Being "born again" is not some magic trick that changes your father. It's the realization - not once but on a daily basis - that you are a son of God, with all the privileges and responsibilities.
my dear, you really hit it on the nose.
the bible speaks very often of being continually trusting, continually faithful, continually hopeful, continually remembering that it is not anything to do with you, but that the lord makes himself close to you so that you can desire to be close to him.
do you have to desire to be back with your father to be accepted? i don't know. but i can't imagine him turning anyone away who desires him, regardless or anything.