Your Lydia Trammel Cook was indeed the sister of my Martha.
James and Emily had 4 children that I know of, and I think it is complete.
Celestine (married Andrew J. Tedrick) born 1867 in Fayette County, IL.
Mary Lydia (who 1st married William Jackson Cook in 1885 in Fayette County, IL and they had ten children) 2nd married Henry T. Stone and then 3rd married Robert Darlington, according to my information.
Martha (who married David Trobridge Bell in Kansas in 1890, they had 13 children, 1 of which was stillborn) Martha was my Great Grandmother.My dad just gave me a matching necklace, ring and broach of hers in a shadow box, I was so excited that it was handed down to me.
Issac was born in 1874 and died in 1875.
Can give you the names, ect of Lydia and Martha's children if you would like them.