# to them ... they

All occurrences of "them" and "they" refer to the people in the crowd.

# Though they are seeing, they do not see; and though they are hearing, they do not hear, or understand.

Jesus teaches the disciples that the crowd refuses to understand God's truth. 

# Though they are seeing, they do not see

Though they are able to see, they do not really see"

# though they are hearing, they do not hear

"Though they are able to hear, they do not listen well"