Rebecca West based The Fountain Overflows on her chaotic family life when she was a girl. I understand it is the first of an unfinished trilogy. If so, I’m interested in reading all of it.
Rose Aubrey is a daughter of an unusual couple. Her father Piers is a writer and editor whom many consider a genius, but he is a gambler who continually impoverishes his family. He has a pattern of collecting followers or benefactors who at first seem to worship him, but eventually they break with him, usually after lending him money. However, his family adores him. Her mother is a gifted pianist, formerly a famous concert performer, who is teaching Rose and her sister Mary with the expectation that they will become concert pianists, too. Their oldest sister, Cordelia, has no talent for music but doesn’t know it. She takes up the violin. Their younger brother Richard Quin is adored by all, a toddler at the beginning of the novel.
The novel covers about ten years of the family’s life. There is plenty of incident, from Mrs. Aubrey’s struggles to keep the family financially afloat to the girls’ struggles at school because they’re considered peculiar but also because they hate wasting time at school when they could be playing piano. Cordelia finds a mentor in one of her schoolteachers who encourages her in the idea that she is talented, which Mrs. Aubrey and the other girls deplore. Rose and Mary meet poltergeist activity at a friend’s house, and the family gets involved in a murder case. Also of importance is the girls’ cousin Rosamund.
It’s difficult to summarize this novel, but this family is so interesting, brilliant, chaotic, well-intended, and right behaving. I found the novel delightful.
What? Me Read? 
I read this a few years ago and loved it. Your review has reminded me that I still haven’t read the second book!
Oh, no! That one’s good, too!