Thanks for getting in touch. Yes, I would very much like any information you can supply on the Western Queins. I've recently been in touch with our mutual cousin LuRue. I sent her the full Quein gedcom, as far as I have it. If you would like one, just let me know.
The Levi Quein line is still something of a puzzle. I think he was married twice, first to Kate Kelsey, second to Bertha Hill?
I managed to find the burial record of William Branch Quein, son of Oscar and Mary Alice. He died 7 April 1913, and was buried at Cypress Lawn Mem. Pk. in San Mateo.