(S (S (NP (NP (BASENP (NNP Sunderland) (POS 's)) (NNS parents)) (PRN (COMMA ,) (BASENP (NNP Laurence) (CC and) (NNP Marianne)) (COMMA ,))) (VP (VBP have) (VP (ADVP (RB vigorously)) (VP (VBN defended) (PP (IN against) (NP (NNS claims) (SBAR (IN that) (S (BASENP (PRPD their) (NN daughter)) (VP (VBD was) (ADJP (ADJP (RB too) (JJ young)) (S (VP (TO to) (VP (VB be) (VP (VBG attempting) (BASENP (PDT such) (DT a) (NN feat)))))))))))))))) (PERIOD .))