| Name | Birth date | Relationship with Sean Mulcahey |
| Baldwin, Walter E. | 1876 | Great-granduncle |
| Baldwin, Walter Edgar | April 18, 1936 | Granduncle |
| Baldwin, Walter Edgar | February 07, 1994 | 1st cousin once removed |
| Baldwin, Wauline Louise | January 12, 1943 | Grandmother |
| | | Ex-wife of the 7th cousin twice removed |
| | | Ex-wife of the 8th cousin once removed |
| | | Ex-wife of the 7th cousin 3 times removed |
| | | Ex-wife of the 8th cousin twice removed |
| Barbara | | Wife of the 1st cousin once removed |
| | | Wife of the 8th cousin once removed |
| | | Wife of the 9th cousin |
| | | Wife of the 8th cousin twice removed |
| | | Wife of the 9th cousin once removed |
| Barbier, Adr. | | 9th great-grandmother |
| Baron-Lukien, Marie-Anne | Abt. 1700 | 8th great-grandmother |
| Barré, Catherine | | 9th great-grandmother |
| Barron, Nic. | Abt. 1670 | 9th great-grandfather |
| Barry, Margaret R. | Abt. 1898 | Wife of the 1st cousin 3 times removed |
| Barton, Susan | | Partner of the granduncle |
| Bau, Catherine | Abt. 1745 | 6th great-grandmother |
| Bau, Jean | Abt. 1675 | 8th great-grandfather |
| Bau, Math. | Abt. 1645 | 9th great-grandfather |
| Bau, René | Abt. 1705 | 7th great-grandfather |
| Bauché, B. R. | Abt. 1690 | 8th great-grandfather |
| Bauché, Bas. | Abt. 1720 | 7th great-grandfather |
| Bauché, Joseph | Abt. 1660 | 9th great-grandfather |
| Beaucher, Françoise | Abt. 1745 | 6th great-grandmother |
| Beaudry, Francis E. | February 24, 1906 | Husband of the 1st cousin 3 times removed |
| Beauvais, Mar. | Abt. 1655 | 9th great-grandmother |
| Bélanger, Louise | Abt. 1630 | 9th great-grandmother |
| Bélanger, Math. | Abt. 1655 | 9th great-grandmother |
| Benóist, Marg. | Abt. 1670 | 9th great-grandmother |
| Benoit, Marie | | 9th great-grandmother |
| Bergeron, François | Abt. 1670 | 9th great-grandfather |
| Bergeron, Marie-Cl. | Abt. 1700 | 8th great-grandmother |
| Bernard, Dan | | 8th great-grandfather |
| Bernard, Jean-Baptiste | Abt. 1715 | 7th great-grandfather |
| Bernard, Josephte | Abt. 1745 | 6th great-grandmother |
| Bernard, Madeleine | Bef. 1798 | 6th great-grandmother |
| | | Wife of the 2nd cousin 8 times removed |
| Bernard, Pierre | Bef. 1783 | 7th great-grandfather |
| Betsy | March 09, 1794 | 4th great-grandmother |
| Betterini, Jeffery Peter | December 29, 1964 | Husband of the aunt |
| | | Husband of the 8th cousin once removed |
| | | Husband of the 9th cousin |
| | | Husband of the 8th cousin twice removed |
| | | Husband of the 9th cousin once removed |
| Bidd, Robert | | Husband of the half 2nd cousin once removed |
| Bingham, Doreen Lynn | September 20, 1968 | Wife of the 1st cousin once removed |
| Blais, Gabriel | Abt. 1745 | 6th great-grandfather |