From your old post your son born 10/2011? And if your daughter is aged 7/8? (If year 4 then aged 8 in IK system).
Our kids studied in 早慧. It is a tough ride to keep up with local stream. You can find DBS, DGS, co-Ed students there. But if you and your kids can keep it, you can have a good Chinese foundation.
Same with my daughter. She is in year 2 and her school offer 45 mins Mandarin class with simplified Chinese daily and dictation of two words every week . I teach her traditional Chinese in cantonese everyday plus a 識字班 in our club house and it's still working out fine at this stage. The simplified teaching is so minimal that it does not create any confusion with my traditional teaching at home. But i can see it would be tough to go on to a more advance level (having her to write short essay / read newspaper) if it's only on me teaching her. Looking for input on how to keep up with her Chinese as well.