Hi Cheran
managed a few minutes at the library today:
All records are from the Town Church, St. Peter Port registers
Jean Mills son of Alexandre Mills and his wife Marie née Eustace, born 2 Jun 1815, baptised 11 Jun 1815, godparents Jean Eustace, Alexandre Mills and Elizabeth Eustace.
Jean also had siblings, including sisters named Sarah, Elizabeth, and Mary Ann (I didn't have time to make an exhaustive search!).
Henriette Le Tissier daughter of Daniel Le Tissier and Anne née Robilliard his wife, born 19 Sep 1813, baptised 29 Sep 1813, godparents Nicolas Robert, Elizabeth Robilliard and Anne Le Tissier.
Henriette also had siblings, including Sophie, Margueritte, and Thomas- again I didn't have the time to research further.
Alfred Mills son of John Mills and Harriet née Le Tissier, born 20 Apr 1840, baptised 2 May 1840, godparents John Mills, John Alexander Mills and Harriet Mills. Note that by this time the English influence meant that many names were being anglicised, so Jean, Alexandre and Henriette have become John, Alexander and Harriet.
Hope that helps you....
Andy