A Tree Grows in Brooklyn, by Betty Smith

Suddenly, the right word about mama came to Francie. "Mama never fumbles."
No, Katie never fumbled. When she used her beautifully shaped but worn-looking hands, she used them with surety, whether it was to put a broken flower into a tumbler of water with one true gesture, or to wring out a scrub cloth with one decisive motion--the right hand turning in, and the left out, simultaneously. When she spoke, she spoke truly with the plain right words. And her thoughts walked in a clear uncompromising line.