We are in a family trip to Singapore and Hong Kong. We have separate ticket from India to Singapore (round-trip) and another separate ticket from Singapore to Hong Kong (round-trip). To put it another way, we will be traveling to Singapore and from there to Hong Kong. Myself and my wife are Indian citizens and my kids are American citizens. Do we need to get any visa? Especially because we will be entering from Singapore. I will have visitor visa to Singapore.

please let me know
thanks
Chemist