Johnny Ball has two children. One of his children is a daughter named Zoe Ball, who is a well-known television and radio personality. Zoe Ball has had a successful career as a radio DJ, television presenter, and media personality in the UK.

She was the first female host of the Radio 1 and Radio 2 breakfast shows for the BBC, and presented the 1990s children’s show Live & Kicking, alongside Jamie Theakston from 1996–1999.

Ball was a contestant in the third series of Strictly Come Dancing. Following this, in 2011 she replaced Claudia Winkleman as host of the BBC Two spin-off show Strictly Come Dancing: It Takes Two until her departure in 2021. Ball also hosted the Strictly Come Dancing Live Tour in 2011 and 2015.

In 2018, Ball was announced as the new host of BBC Radio 2’s flagship breakfast show and took over from Chris Evans in January 2019.

The information available does not specify details about Johnny Ball’s other child or provide additional information about them.