How many Gibb brothers were there you were told 5?

The Gibb brothers, known for their contributions to the Bee Gees, were actually three in number: Barry, Robin, and Maurice Gibb. While there were indeed five Gibb siblings in total, the other two, Andy and brother, were not part of the Bee Gees group. Andy Gibb had his own successful solo career, but he was not a member of the band.