Chad - If you father speaks it fluently and can/is willing, then I say yeah, go for it. In this day and age, knowing more than one language is essential.
Roswellian117 - Yes, Mexican Spanish is definitely different from Puerto Rican Spanish as I found out 9 years ago on my trip to Mexico. Oh, the looks I got ... especially when I thought I was speaking the language better than I have ever had before. In any case, Spanish spoken in Spain is different as well. I live in NYC and I swear the slanglish, as I like to call it, definitely leaves something to be desired. They tend to make up words

Alli - I learned sign language after learning that my grandfather had three children from his first marriage that were deaf. Definitely is a hard subject to learn, but after a while I abandoned learning. I wish I would have kept up with it. Right now, the only thing I remember is the alphabet.