The mother is Nicolas Angot Jr. is listed in only two official documents as follows. Marriage record of her son Nicolas Angot Jr. & Anne Galais. Here Marie is listed as "Marie Langlois". Death record of her son Nicolas Angot Jr. where she is listed as Marie LeFort.
The second record is most likely to be correct based upon the fact that the family if back in France where several family members are present & the clergy performing the funeral service would be familiar with the family & as a result are more likely to make a correct registry of the family. Links are below & copies of records are attached.
http://worldconnect.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=katheriot&id=I57973
Death Certicifate list his mother as Marie Lefort: http://archives-en-ligne.ille-et-vilaine.fr/thot_internet/ark:/49933/thtpnvx0mqbp/121916/20
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