The sisters and daughter followed shortly after and met Monk in Hawaii, where they have been holidaying on the west coast of the Big Island in Kailua-Kona.
Hunter, 51, filmed an episode of Tour of Beauty in Hawaii in 2017.
She has posted images looking as fit as ever in her swimwear, paddling in the tropical waters and told her social media followers she loved the fabulous Big Island Retreat Villas in Kona.
Her son Liam Stewart has missed out on the tropical family vacation, but is still enjoying the winter wonderland of Queenstown, where he is playing ice hockey for the Southern Stampede.
Last week he and Kiwi girlfriend Bella Spooner enjoyed red wine at Gibbston Valley Winery for Spooner's 25th birthday.