( ( ( They and ) ( their families ) ) ( ( are ( ( a part ) ( of ( our family ) ) ) ) . ) )
(ROOT (S (NP (NP (PRP They)) (CC and) (NP (PRP$ their) (NNS families))) (VP (VBP are) (NP (NP (DT a) (NN part)) (PP (IN of) (NP (PRP$ our) (NN family))))) (. .)))
They and their families are a part of our family.
(ROOT (S (NP (NNP Haumea)) (VP (VBZ is) (NP (NP (NN part)) (PP (IN of) (NP (DT the) (DT a) (JJ collisional) (NN family))))) (. .)))