( ( This relationship ) ( ( is ( similar ( to ( a ( parent-child relationship ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN relationship)) (VP (VBZ is) (ADJP (JJ similar) (PP (TO to) (NP (DT a) (JJ parent-child) (NN relationship))))) (. .)))
This relationship is similar to a parent-child relationship.
(ROOT (S (NP (NNP Children)) (VP (VBP resemble) (NP (PRP$ their) (NNS parents)) (SBAR (IN because) (S (NP (PRP they)) (VP (VBP have) (NP (JJ similar) (NN dna)))))) (. .)))