Individual Details

1850 Census. Dist 7, Boone Co IN, Hh 1477
Silas Miller, age 26, farmer, b. IN. Mary F., age 22.
William W. age 2. Nancy M. Miller, age 4 months
Jane Larrimore, age 24.
His brother John Miller was next door in Hh 1478

Indiana State Libary marriage database online:
Silas Miller married Mary Larimore, 21 Jun 1846, Hamilton Co IN

I believe that Mary remarried after the death of Silas - and Baird may have had children from a former marriage as well.
1860 Census. Jackson Twp, Boone Co, IN, Hh 1119
Ratley Baird, age 53, farmer, b. KY
Mary, age 35, b. IN
William H., age 12, b. KY
Alice, age 7, b. IN
William W. Miller, age 12, b. IN

Indiana Marriages on Ancestry: Mary F. Miller married Ratliff Baird, 15 May 1860, Boone Co, IN


This child is obviously not a daughter of this Silas [she's practically the same age], but no other men of that name are known to be living in Boone Co. Strange. The marker appears to be quite old but I'm not sure as old as 1839. The stone is pictured on FindAGrave.
Marker in Eagle Village Cemetery, Zionsville, Boone Co IN:
Mary
Dau of
Silas & Rachel Miller
Died
Jan. 15, 1839
Aged 16 y & 13 d.

Birth	1823	Indiana
Marriage	21 Jun 1846	Hamilton County, Indiana - Mary F. Larimore
Death	1850	Boone County, Indiana

Spouse	Mary F. Larimore (1828 - )
Child	William W. Miller (1848 - )
Child	Nancy M. Miller (1850 - )

Father	WILLIAM MILLER (1781 - 1844)
Mother	NANCY MEEK (1782 - 1848)
Sibling	Moses M. Miller (1809 - )
Sibling	William W. Miller (1811 - 1901)
Sibling	Thomas Putnam Miller (1812 - 1891)
Sibling	John Miller (1816 - 1906)
Sibling	Margaret Miller (1817 - 1878)
Sibling	Rachel Miller (1819 - 1892)
Sibling	Alexander F. Miller (1821 - 1851)
Sibling	EMMA ELIZABETH MILLER (1825 - 1871)
Sibling	James Miller (1830 - 1847)