Andrew and Mary M. Weir appear in the 1870 census, Fairbanks Twp., as follows:
Weir, Andrew38Farmerb. IN "Mary M.32Keeping Houseb. IN "Martha A. 13b. IN "John2b. IN "Levi11/12(b. Aug. 1869 - IN) Wyman, Henry74b. KY
Henry Wyman was Mary M. Wyman's father.
Also in 1870 Fairbanks Twp. was the following household:
Weir, Andrew71Farmerb. NC "Margaret A. 67Keeping Houseb. TN "Elizabeth39At Homeb. IN "Mary M.33At Homeb. IN "Sarah L.31At Homeb. IN
This elder Andrew Weir was the father of the Andrew Weir who married Mary M. Wyman.The three daughters above, are unmarried sisters of the younger Andrew.By checking the 1860 and 1850 censuses, the elder Andrew and wife Margaret Ann had nine children as follows (the years of birth are based on the ages given in the censuses and are therefore approximations):
1. Elizabeth1830 2. Samuel Andrew 1832 (the younger "Andrew") 3. Mary Malinda1837 4. Sarah Lucinda 1839 5. Margaret Jane 1839 (Sarah & Margaret were twins) 6. William Y.1841 7. Joseph M.1844 8. Martha1845 9. Nancy1845 (Martha & Nancy were twins)
Unfortunately at this point I don't think I've found your Melvina Elizabeth Weir.Unless - could she be the "Elizabeth" above?I did not find a middle name or initial shown for her anywhere.Did your Melvina Elizabeth marry late?The Elizabeth above would have been about 43 if she married in 1873.Also, I do not find this Elizabeth Weir in the 1880 Sullivan County census - which could mean any number of things, but would be consistent with her having married in 1873.
Back to Andrew and Mary M. Weir:They were married April 13, 1856.Their daughter Martha Ann married Theophilus Lloyd in 1875 in Sullivan County.Their son John was reportedly mayor of Marshall, Illinois.
I could tell you more, but at this point I'm not sure if we're going in the direction you need to go.For example, Henry and Jane Wyman (Mary M.'s parents) are in 1850 Fairbanks Twp. with 5 children and also an elderly Sarah Miller who I believe to be Jane Wyman's mother.
I don't feel I've solved your puzzle, but I hope this helps.Let me know if you have any further questions.Again, here I've skipped over more info available on this family, not knowing if this family is the one you're looking for.