He is the third oldest or the middle of the the "children"
Harry Houdini is the second oldest in his family.
He's the second of the six children in his family.
she is the youngest
Youngest
oldest
Oldest
Thomas Edison was the youngest in his family
She is in the middle.
I rather be youngest because both parents love the youngest than the oldest.
John Cena is a WWE World Heavyweight Champion. Cena has four brothers in his family. He is the second oldest son.
She is the youngest in her family. She has an older brother, Cameron Stewart.