(S (S (S (BASENP (NNP Lowther-Pinkerton)) (VP (VBZ is) (NP (BASENP (DT the) (NN son)) (PP (IN of) (NP (BASENP (NNP William) (POS 's)) (BASENP (JJ private) (NN secretary))))))) (SBAR (IN while) (S (BASENP (NNP Pettifer)) (VP (VBZ is) (NP (BASENP (DT the) (NN son)) (PP (IN of) (NP (NP (BASENP (NNP William) (CC and) (NNP Harry) (POS 's)) (BASENP (JJ former) (NN nanny))) (COMMA ,) (BASENP (NNP Tiggy) (NNP Legge-Bourke))))))))) (PERIOD .))