Grace Livingston Hill 
Cloudy Jewel 

Gentle, lovely Julia Cloud has devoted her life to caring for others. Now, after her invalid mother’s death, she is without the financial means to live on her own. But she dreaded accepting her selfish younger sister’s offer to come and live with her and take care off her demanding children.
Then, just when Julia resigns herself to a bleak future as a servant in her sister’s home, something amazing happens! Julia’s lively young niece and nephew, her deceased brother’s children, turn up on her doorstep with a thrilling proposition. Suddenly Julia is thrown into an exciting adventure—and she discovers more happiness and love than she ever dreamed she could have!