Peter Theodore Alphege Rees-Mogg was born 2007 to Jacob William Rees-Mogg (1969) and Helena de Chair (1977) .
Siblings
| Name | Birth | Death | Joined with |
| Peter Theodore Alphege Rees-Mogg (2007) | 2007 | ||
| Mary Anne Charlotte Emma Rees-Mogg (2009) | 2009 | ||
| Thomas Wentworth Somerset Dunstan Rees-Mogg (2010) | 2010 | ||
| Anselm Charles Fitzwilliam Rees-Mogg (2012) | 2012 | ||
| Alfred Wulfric Leyson Pius Rees-Mogg (2016) | 22 February 2016 | ||
| Sixtus Dominic Boniface Christopher Rees-Mogg (2017) | July 2017 | ||