It's unkind to avoid a family member on their birthday.
Nate's sister Nika has sent him an invitation to her birthday party.
Nate wants to respond to the invitation.
Nate tells Nika that he will go to the party.
Nate tells Nika that he can't attend her party because he is busy.
Nika will feel that Nate is a good brother.
Nika will feel that Nate does not have time for her.