Hi, Putri, how are you ? I hope you are fine, I did not hear from since their last we spoke. My experienced to teach my children, the first I never forget to teach and spoke with them my mother tongue, that is Indonesian language, because it is important that children know mother language, is important that children came from 2 different culture, the can compare also how behave, example in Indonesia, children are polite to people ouder than them, here in Holland not , soms.
I make a schema when I spoke indonesian with my children , just used example if youour son said bord, than you can explain to him, in indonesia is mean PIRING and so on, and so on.
So, my 4,5 years old son, now he speaks 3 languages, english, dutch and indonesian, I have aupair from Indonesia (servant with me from Indonesia) , he learned dutch very quick from my son and my son also learn indonesian from him.
So, I think is not difficult , just how you approach to him with your way , you are his mother, soms people said that you live here in Holland you should speak to your son dutch, dont be confused from what people said to you, because automatically he learn dutch from your dutch husband and school and envrioment, so dont miss up with that.
Just do the way you like it, the same also with how to araise your son, is your way , people in Java said, norm and value, love and carrying that is our way to bring our children up, sometime in this country hard to put this way, because too much freedom, but from little learn and when they grouw up, the get to used to it (Kecil belajar, besar biasa).
My daughter now is almost 18 years, she speaks 5 languages, I dont teach the other languages , she like to learn by herself.
easy way to teach your son with telling satu, dua , tiga.
o.k. good luck, talk to you later o.k.