I believe there is some confusion as to which Colbert Anderson married Isabelle VanMeter that I can now clear up. There are two options to consider: (1)The son of Colbert Anderson, Jr. whom I will designate as Colbert III. or (2) Colbert the son of James Anderson and grandson of Colbert Anderson Jr.
The household of Colbert and Isabelle VanMeter Anderson is found in the 1850 census neighboring that of Isabelle's father.In this record Colbert Anderson indicates his age as 42, i.e. born in 1808 several years after the death of Colbert Anderson, Jr. so that would seem to take Colbert III out of the running leaving us with Colbert, son of James, as the likely man.
For kicks I have attempted to get some fix on the birth year for Colbert III.This I think I can now do from an examination of the court records for the Estate of Colbert Anderson with William Anderson, Executor.For example, among payments to heirs made in 1816 we have a payment to Thomas Anderson guardian for Colbert Anderson.I believe this tells us that Colbert III is not yet age 21, i.e. born after 1795.Indeed several other heirs receive their shares through the agency of a guardian such as Joel Ward who is guardian of James Anderson's children.Again in 1817 Colbert III gets his share through Thomas Anderson, his older brother, but by 6 Apr 1819 Colbert Anderson III is, it seems, old enough to receive payment in his own right. I conclude, on this basis that Colbert Anderson III was born between 1796 and 1798, at least 10 years before his nephew of the same name.I don't know what happened to Colbert Anderson III after this, but I am sure he did not marry Isabelle VanMeter.