French name was De Waneau
Originally from the French border near Verdun Germany
Had 4 children (3 born in Ireland, Mary born in MI)
1) John (drafted and served in Civil War)
Born 1838 Ireland, married Catherine Breen (1840-1918), had 6 children from Bishop family tree
Civil war pension records for John Dewan
State Filed: Michigan
Relative: Mother Sarah Kelly
Roll Number:T288_120
service G 101 IL Infantry
Note: NPS Soldiers database has "John Duwan" in Illinois 101 Infantry Regiment
1880 censurs: Children (Bridget and John) born in 1863-1864 were born in NY, rest were born in MI
John Dewan 40
Catherine Dewan 40
Bridget Dewan 17
John Dewan 16
Mary Dewan 14
Martin Dewan 12
Patrick Dewan 10
James Dewan 8
Census records have birth dates of 1833, 1838, 1840

2) Michael (civil war draftee with one leg shorter than the other)
Michael Dewan
B:Jan 1842 in Ireland D:1 Jun 1926 in Clinton, Lenawee Co, Michigan
Clinton, Lenawee Co, MichiganBurial in St. Dominic's Catholic Cemetery, Clinton, Lenawee Co, Michigan -- Plot: Section A Row 4, Age at Death: 83
Note: Mother Sarah Kelly also buried in same section and row

3) Thomas Peeler (served in Civil War; spent last month in Detroit hospital)

4) Mary A. born 1853, died 1910
Married John Gray (bb 1825, d 1916)
Birth 14 Apr 1853 Death 8 Dec 1910 in Clinton, Lenawee Co, Michigan; Gray family tree says she was born in Ireland but they immigrated in 1846 so this is wrong if this is the correct Mary Dewan of Clinton MI. They had 7 children.

From findagrave for Mary
Birth: Apr. 14, 1853, Ireland
Death: Dec. 8, 1910
Clinton Lenawee County
Michigan, USA
Family links:
Spouses:
John Gray (1823 - 1916)*
*Calculated relationship
Note: Aged 57 Years
Burial: Saint Dominics Catholic Cemetery
Clinton Lenawee County Michigan, USA Plot: Sec. A, Row 5
Note: Brother Michael and Mother Sarah Kelly buried in Sec A, Row 4

From Find a grave index for John Gray
Birth: Feb. 5, 1823, Ireland
Death: Jan. 17, 1916
Bridgewater Washtenaw County Michigan, USA
Family links:
Spouses:
Mary A. Deivan Gray (1853 - 1910)
Margaret A. Gray (1821 - 1861)* *Calculated relationship
Note: Aged 92 Years.
Burial: Saint Dominics Catholic Cemetery
Clinton Lenawee County Michigan, USA Plot: Sec. A, Row 5

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Wife of John Dewan may have been Sarah Kelly (born in Ireland) - from son John's pension records and daughter Mary's family trees on ancestry

Family traveled to New York and then Clinton MI from Ireland in 1846

From the James Fitzpatrick family tree for Mary Dewan Gray and John Gray
Sarah Kelly
Birth 1812 in Ireland Death 1892 in Clinton, MI Lenawee County

Findagrave
Birth: 1812
Death: Aug. 19, 1892
Burial: Saint Dominics Catholic Cemetery
ClintonLenawee County
Michigan, USA Plot: Sec. A, Row 4
Son Michael Dewan is also buried in Sec A Row 4
Daughter Mary Dewan and husband John Gray are buried in Sec A, Row 5