Using the Calif. Birth Index on Ancestry, here is what I found: Wilma Jene Robinson b 25 Aug 1926 in Solano Co. Audrey Lorraine Robinson b 28 Nov 1927 in Santa Cruz Co. David Lowell Robinson b 1 Apr 1929 in Sacramento Co. Betty Lou Robinson b 11 Nov 1930 in Solano Co. Ronald Keith Robinson b 15 May 1932 in Solano Co. The 1930 Census is interesting. Suisun Township, Fairfield Town, Solano County. The household includes: Wright, Walter 53 married at 21 b MO Nancy 49 marr at 17 b MO Ida M. 19 b MO dau Wilbur R. 12 b CA son Robinson, Velma E. 23 marr at 18 b MO daughter Samuel D. 24 marr at 20 b OK son in law Wilma J 3 b CA granddau Audrey L. 2 4/12 b CA granddau David L 1 b CA grandson Verhael, Audrey B 21 b MO daughter John R. 1 4/12 b CA grandson You might try writing to Solano Co. Historical Society for more info. They have been very helpful to me. With the info you have now on the youngest, you should be able to get a death record from Solano Co. It might be possible also to get one for their father. Good luck with your research. Margaret R.