I Have the Rockingest Friends
I think getting Iz a tutor is a most excellent idea. Kids who get tossed into total immersion in a foreign language are typically getting immersed in the language that is dominant, eg. TV, bill boards, store signs, etc. Hispanic kids live in an Anglo world, except when they are at home. It's like Seymour's dad learning English - it's not like he wasn't totally surrounded by the English language once he got here. It's impossible for you to provide a Spanish world for Iz, unless you relocate to Forth Nair Oaks ... , so I think tutoring is a superb plan.