There is a huge tax incentive living in Singapore. The top tax rate is 6%, plus you get up to 2 years to pay it. If the husband is working there he would likely be on an employment pass, and the rest on a dependent pass attached to him. Roxy might even qualify for her own EP given how much she probably earns through her business in Aus. I don’t think the travel is visa related, it’s just what expat families in Singapore do. There are so many places to visit, all within 2-3 hours flight away, plus the kids are more than likely on school holidays again because of Lunar new year.