Mine are very young, but we are using TalkBox.Mom which has been great (we use Japanese every day!) For myself I used Tofugu's mnemonics to learn hiragana and katakana in a matter of days, and plan to use Genki for self study. I also listen to native speaker audio daily in the form of podcasts, music, television, etc. After I have a more solid foundation I plan to use iTalki for conversation practice.