Family members are expected to attend each others events.
James is  at home when his mom calls and tells him to come over for a family gathering at her place.
James wants to respond to the invitation.
James tells his mom that he'll be there tonight and asks her if he needs to bring anything.
James tells his mom it's too short notice, and he's already planned out his evening tonight.
James' mom is delighted to hear that James is going to be there and is excited to see him.
James' mom is disappointed he won't be there and thinks James doesn't prioritize family enough.