Can sing China National Anthem but not Negaraku

Jo can sing China National Anthem but not our Negaraku, shame on us as we never teach him. Last Friday, we sang the China National Anthem while the anthem was playing during the Olympic opening ceremony, we know how to sing it as we have been listening this anthem for 3 years. What's more Jo is attending the school here, then undoubtedly he knows the anthem well. But Malaysia is our home country, we still need to instil more Malaysia culture to this little boy and we do not want him to forget his home country. I think i better buy him the Negaraku song and even flags while this round back to Sabah..