Unfortunately, I don't know if your yahoo account is current but in trying to locate you, I did find one Richard Whitmer who had just recently passed away at age 80. Perhpas this is your father?
Anyhow, George Gicker was born in 1864 in Chester, PA, son of Jacob Gicker and Louisa. Brother of Jacob Allen Gicker and Liddie Gicker, both who lived out their lives in Delaware. Jacob A. Gicker married Mary E. Kelley (daughter of John P. Kelley and Mary Roth of Philadelphia). Information is zip of Liddie but I'm sure I'll find some.
My website is at http://www.geocities.com/jomilu2001
. I look forward to hearing from you.