[spoiler alert] A family drama set in contemporary San Francisco, this novel seems a literary precursor to the film "The Kids Are Alright": sparring lesbian moms (one conventional, one artistic misfit) parenting a restless teenage son, whose biological father, a rebel tamed by a mainstream midlife career, dropping into the domestic scene now and then. But this is a much more piercing, less stereotypical examination of a nontraditional family than a two-hour, basically feel-good film can provide. What's here is distinctly anti-Hollywood, for Christopher, the teenage son, is diagnosed with schizophrenia, and his mental fracture both reflects and intensifies the divisions within and between the adults charged with his health and wholeness. Nan, his birth mother and the more conventional of his lesbian mothers, becomes the expected mama grizzly, sacrificing her other emotional ties in her efforts to slow Christopher's ever more frightening descent into madness. Hal, Christopher's (gay) biological father, a punk rocker-turned-accountant, appears to embark on a second adolescence as he struggles to find a partner for his externally put-together, internally needy soul. Marina, a painter whose artistic koan is to depict the perfect tree, has to confront her desire to roam outside her domestic life when that domestic life no longer provides stability she can rely on. [to be continued]