Theory:

So it’s smiling and smirking,
Smug as can be;
But poor old Dad’s
Still;
 
Stuck;
Up;
The;
Tree!
Explanation:
 
Stanzas \(13\) and \(14\) depict how the cat was happy and content after reaching the ground, whereas the child's father was stuck in the cat's place when he sought to aid the cat. The poem ended on a humorous note, as the child's father, who had hoped to save the cat, had eventually got himself in its position and had become a comic figure.
 
The Child's father stuck on a tree.jpg
The Child's father stuck on a tree
 
Meaning of Difficult words:
 
S.No
Words
Meaning
   1.
Smirking
Smiling at someone or something with satisfaction and joy
   2.
Smug
Showing much pride in achieving something
Reference:
National Council of Educational Research and Training (2007). Honeycomb. Dad and cat and the tree - Kit Wright (pp.107-109). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.