Have you tried Find-A-Grave to identify siblings etc...that can help you in your search? If not, here is what I found at: http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=41988455
Click on each of the siblings name to identify any children they may have who may be living. If you need more help, feel free to email me and I'll give you some ideas that I've used to track down relatives.
Louella Carolyn Johnson Northam
According to her Findagrave memorial, her parents were Peter Johnson and Katherine Janzen.
Here are her 1930 and 1940 census records.
Hi I may be related!! Biological daughter of Carolyn Jean Johnson who’s grandmother is Louella Johnson I believe. I was born in Anaheim California.