Larry Leroy Achterberg

- I am looking for any information on my dad's family.His father is Glen Achterberg born may 7, 1911. and he married Maragerite Adie Whitman.My Great Grand Father is Roy Walter Achterberg born 2-2-1883 in Brookings County, SD and died 1973 in Granada Hills, Ca.He married Edith Lamb.My Great-Great Grand Father is Fred Achterberg born 1850 in Beaver Dam, Wisconson died 1940 in Ingelwood, Ca.There is not may left of my Father's family left with info.If any one could help.Thank You