Thomas Standley and Merissa Milligan, TN>MO

They married in 1832 in Wilson Co, TN
The Bondsmen was William W. Milligan.
Whom I found buried in Lawrence Co, IL whom on the stone says son of J & R Milligan, assuming this is James and Ruth Templeton Milligan.
I believe that William is Merissa's Father, She was only 15 when she married Thomas Standley.
Also I believe he is the Father of David Templeton Milligan.

Does anyone have any good knowledge of this family?
There seems to be a lot of unsubstantiated claims on Ancestry.