I was to was back to let his parents .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 I)) (VP_4 (VBD_2 was) (S_2 (VP_0 (TO_0 to) (VP_1 (ATVP_4 (VBD_0 was) (RB_1 back)) (S_2 (VP_0 (TO_0 to) (VP_1 (VB_0 let) (NP_3 (PRPDOLLAR_0 his) (NNS_0 parents)))))))))) (DOT_0 .)))