Teaching Tagalog to American kids or husbands alike is easy because, Pinoy mothers/wives will always mumble Tagalog words every now and then when they are talking to their kids/hubbies especially if they are giving them a hard time. Trust me, when Pinoy mothers are having a problem with their kids/husbands they will always express their anger, frustrations and sentiments in their own language and kids/husbands will always pick them up. They know when mommy/wifey is in a bad mood because… she is saying, mumbling and hollering those weird words again. And that I believe is a transition that every Pinoy abroad has to go through. So, I don’t think they really need a proper school or an accredited tutor to learn the language? Trust me, one way or another, they will learn it - the hard way.
With my Hubby, I have tried to teach him some Tagalog phrases [like Mahal kita (I love you), Maganda ka (You're beautiful) and Kelangan mo ba ng pera? (Do you need money?)] but he keeps forgetting them specially the last one. (Hehehe) He would struggle so hard with the pronunciation and would eventually give it up altogether.