I am glad that your Dad has more open mind and willing to learn ASL and explore in the Deaf Community.
I raise oral myself until about 1970's. School established Total Communication mixing SEE and Oral. My Dad is Deaf, he uses oral and sign. My Mom is hearing, she uses more signer than my Dad. I had mixing with many languages during my childhood. Until, I enter College, I learned so much more about ASL and Deaf Culture. Now, I admire to work with Deaf people for four years. 
