No cable because I don’t want to monitor it and there is too much garbage in the programs and advertisement. I did watch a lot of TV in Spanish when working on my own learning, but I was older. Maybe your kids are good to go with telenovelas and other programs.
The videos they watch are not always much better but they get Spanish and no advertisement except for more movies.
All the popular kids movies work in my opinion. They have watched everything Harry Potter in Spanish several times. Cars series, Toy Story, Scooby Doo, Avatar,Zorba the Greek,Wrath of the Titans, Lots of Disney like Robin Hood, Jungle Book 1 & 2, Three Witch mountain movies. Percy Jackson Stuff, Diary of a Wimpy Kid and just to much random stuff to recall. Just like kdis do in English they watch the movies multiple times in Spanish. They will watch some of my wife and my choices of movies in Spanish but they are usually are in bed by then and we hardly watch anything anyway. We haven’t found lots of science and nature in Spanish. They say they have watched a few but not that many.
Enrollment fell of a cliff and they had to make combo classes with kids from non-bilingual classes. The Dual language program my youngest is in in another district has a big waiting list. They could make 3 new kindergarten classes. It will be going into the 3rd year , Kinder, first, now second. It goes until 5th grade.
I don’t know much about Rosetta Stone. Just think of it as some kind of canned program, which could be wrong. I did stuff on tape and book drills but exposure to life in Spanish is what makes it work. That is not something that is easy to come by for everyone so the TV and Radio (usually in the car) are key. Reading is good…reading what they like to read but in Spanish with the tutor. Let the classroom time at school be about grammar drills and all the usual stuff.