For info from the Independent:
It is believed that the prime minister has seven children, however he has not officially confirmed the exact number.
What is known is that the prime minister and his second wife, Marina Wheeler, who separated in 2018, have four children together: Lara Lettice, 27, Milo Arthur, 25, Cassia Peaches, 23, and Theodore Apollo, 21.
Mr Johnson also has a fifth child, Stephanie Macintyre, who was fathered as a result of an affair with art consultant Helen Macintyre.
During [the] court proceedings, it was alleged that Stephanie Macintyre was one of two children the prime minister fathered as a result of an affair.