Grace Livingston Hill 
In Tune with Wedding Bells [EPUB ebook] 

Reuben Remington, a young architect at the top of his career, has waited a long time for this success and is finally ready to do some celebrating on holiday at a Long Island beach house. But then a girla waif of a womancollapses right in front of him, and when she is carted off to the hospital, her little brother is left in need of a temporary guardian. Inexplicably, Reuben is drawn into the upside-down life of Gillian and Noel. Could offering solace to these two alter the well laid out plans Reuben has for the rest of his life?