Clover by COOLIDGE, Susan

Clover is the fourth book in the popular What Katy Did series. After Katys wedding, the focus shifts to her little sister Clover. Their brother Phil encounters serious illness in the winter, and Dr. Carr sends him with Clover to the mountains of Colorado. Clarence Page, their naughty cousin from the other books, lives nearby. He is a rancher now with an attractive English partner, Geoff Templestowe, whom Clover falls for.