their parents , wise folks that they are 
(ROOT (NP (NP (PRP$ their) (NNS parents)) (, ,) (NP (NP (JJ wise) (NNS folks)) (SBAR (WHNP (WDT that)) (S (NP (PRP they)) (VP (VBP are)))))))
(ROOT (NP (NP (PRP$ ) (NNS )) (, ) (NP (NP (JJ ) (NNS )) (SBAR (WHNP (WDT )) (S (NP (PRP )) (VP (VBP )))))))