One of the biggest markers of integration is having a stable marriage with a Singaporean, especially of the preferred race.Pinkpanther wrote: ↑Tue, 01 Dec 2020 3:20 pmUltratech, then I agree it's a bit of a mystery. All the best. I hope it works out in the end.
To answer your question, markers of integration that I think are important: 1) kids in local school 2) HDB over condo 3) learning one of the three official languages 4) community club membership and participation in community events (but not volunteering and making donations - red flags for ICA unless done in conjunction with participation). As always, it's a bunch of factors that determine outcome, of which integration is one. With a child in local school, perhaps you ticked the integration box and it was something else. Did you wait for a long time before applying for citizenship? Any other evidence that you may not be committed to Singapore? And finally, an odd question that you don't need to answer - do you speak Hindi? North Indians don't seem to be doing well.
Having said that, where do you pick up that he is an Indian? Some of the anecdotal evidence suggests that Tamilians and Punjabis seem to do slightly better. If that's true, it's probably because there are a few more of them among Singaporeans who've lived here for a few generations and therefore someone coming in from India might be in a better position to integrate with the ones who are here already.