And, I don't know, it's like my grandparents, I'm the youngest one.
( And ( ( , ( ( I ( ( do n't ) ( ( know , ) ( it ( 's ( like ( my grandparents ) ) ) ) ) ) ) , ) ) ( I ( ( 'm ( the ( youngest one ) ) ) . ) ) ) )
(ROOT (S (CC And) (PRN (, ,) (S (NP (PRP I)) (VP (VBP do) (RB n't) (VP (VB know) (, ,) (SBAR (S (NP (PRP it)) (VP (VBZ 's) (PP (IN like) (NP (PRP$ my) (NNS grandparents))))))))) (, ,)) (NP (PRP I)) (VP (VBP 'm) (NP (DT the) (JJS youngest) (NN one))) (. .)))
I know I am the oldest one. 
( I ( ( know ( I ( am ( the ( oldest one ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP know) (SBAR (S (NP (PRP I)) (VP (VBP am) (NP (DT the) (JJS oldest) (NN one)))))) (. .)))