We asked our presenters to tell us about their siblings.
Leah is a middle child, with an older brother and a younger sister.
She went to London to meet up with them and quiz them all about what it was like growing up with her as a sister.
Ayshah: I'm the youngest, but I feel like the oldest
See 5-year-old Fabrizio's reaction to his new baby brother
You tell us what it's like to be a brother or sister
Check out the spacecraft on a mission to Mercury
Who do YOU think will win Strictly Come Dancing?
Quiz: Can you spot these sneaky sea creatures?