Granddad had seen something one night.
( Granddad ( ( had ( ( seen something ) ( one night ) ) ) . ) )
(ROOT (S (NP (NNP Granddad)) (VP (VBD had) (VP (VBN seen) (NP (NN something)) (NP (CD one) (NN night)))) (. .)))
Grandfather was blind and couldn't see anything. 
( Grandfather ( ( ( ( was blind ) and ) ( ( could n't ) ( see anything ) ) ) . ) )
(ROOT (S (NP (NNP Grandfather)) (VP (VP (VBD was) (ADJP (JJ blind))) (CC and) (VP (MD could) (RB n't) (VP (VB see) (NP (NN anything))))) (. .)))