DJ and radio presenter Trevor Nelson grew up in London and came to find out he had half siblings on the Caribbean island of St Lucia. However, for Trevor and his three sisters who were raised by his parents in the UK, this was something that didn't really have an impact on his family life until much later when Trevor finally met his half siblings.
It's something that has fascinated Trevor all his life, and now in this series of One to One, he meets people to uncover what it's like to have, or to find out you have, half siblings.
In this programme, Trevor meets Adrienne who has eight half siblings but no full brothers and sisters. She tells Trevor that that there is no jealousy and rivalry and that they really are one big happy family. Really?
The producer is Perminder Khatkar.