There has been no shortage of bilingual Spanish-language family music released over the past couple years, not just traditional music, but also some with a bit of rock -- Dan Zanes is perhaps the best-known, but others like Mariana Iranzi also recording albums.
One that I've been waiting for since the beginning of the year is the debut from Moona Luna, the family music alter-ego of Latin-alternative band Pistolera. They've had a couple tracks on their website for awhile now, but now they've got three up in blogger-friendly Bandcamp form. The band, led by singer-songwriter (and new mother) Sandra Velasquez, is actually recording two albums simultaneously -- one as Pistolera, one as Moona Luna -- so that probably explains why it's taken so long. But based on the tracks they've released thus far, I think it might be worth the wait.