Hi Peggy - well it's me again with more. There is an Isaac N. Williford TN TN TN age 76 in the Mendocino Co., CA 1900 census. He is living with his daughter Susan Ryanaldo and her husband James A. and 2 sons. This Isaac is also in the 1850 AR census. This may be the one you are finding with land. I'm not sure when your Charles went to CA but the only Charles I find in 1900 is one age 10 CA CA CA, and one b 1863 IA KY PA, so these aren' your Charles. I do hope this may help your sleuthing.