The model loves ‘every second’ she spends with her grown-up children.Christie Brinkley with her three kids, Jack, Alexa, and Sailor, in September 2018.Credit: Getty ImagesThe GistChristie Brinkley welcomed her first child, Alexa Ray Joel, in 1985 with then-husband Billy Joel.She and ex-husband Richard Taubman welcomed her only son, Jack Paris Brinkley-Cook, in 1995. Jack was adopted by her fourth husband, Peter Cook.Brinkley and Cook welcomed a …