The family. 
( The ( family . ) )
(ROOT (NP (DT The) (NN family) (. .)))
A group of related people.
( ( ( A group ) ( of ( related people ) ) ) . )
(ROOT (NP (NP (DT A) (NN group)) (PP (IN of) (NP (VBN related) (NNS people))) (. .)))