Theme of this passage is
b) The grass is always greener on the other side.
It is human tendency to always think that the other person is getting more than us. Same conflict can be seen in this passage. The theme of dissatisfaction can be seen here in the given passage.
Tessa's mom spends less time with them so they want more time with their mother but Kate's mother is always with them so they want little space from her.
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