The gravestone for Vivian Viets Griswold (d. 1833) uses the abbreviation aet.
E. & P. GRISWOLD,
March 1st, 1833,
aet. 18 mos. & 10
A spirit too pure for Earth
His parents are Ezra and Philecta Griswold, as stated on the nearby gravestones of his sisters Fredonia Elvira Griswold (d. 1825) and Lemora Fredonia Griswold (d. 1826).
Oak Grove Cemetery, Delaware County, Ohio