In 1870, the twins were named Catherine and Jane; by 1880 they had become Fanny and Emma. Obviously using middle names.
Fanny married D. C. "Lum" Goff. Still living when father wrote his will 28 Sep 1925.
Catherine\Fanny ALLEN and D. C. GOFF were married on 19 January 1896 in Polk County, Arkansas.209 D. C. GOFF was born (date unknown).