Thanks Jillo, Reba, Cheri, Angel and Highlands.
I forgot to mention...I did ask my dad how did he know that Deaf people use ASL to communicate cuz of his comments. I was wondering if u knew deaf people growing up. He said he didnt know of anyone who was deaf personally but he has heard about sign language. What cracked me up was his comment "Anyone with common sense should know that it is easier for Deaf people to communicate using sign language than spoken language. Anyone who doesnt think that is nuts!"
Everyone bust out laughing when he said that. That was a good one. 
