Based on a review of pension records:
Orrin W. Trembly was born in 1838, possibly the son of Maria (b. 1810).
Orrin was living in Bath, Clinton County when he married Isabelle Vallencis (d. 1860), also from Bath, in Lansing, Ingham County, and they had at least one child: Orrin J. (b. 1859)
Orrin was a 23-year-old widower and possibly living in Livingston County, Michigan, when he enlisted as a Musician in Company C on May 13, 1861. He was reported sick in the Regimental hospital in July of 1862, and died of typhoid fever on July 24 or 25, 1862, at Harrison’s Landing, Virginia. He was buried in Glendale National Cemetery: section B grave 161.
In 1863 Maria C. Trembly was appointed guardian of Orrin J. In 1865 she filed an application for a minor child pension on behalf of Orrin (no. 71988)