It's rude to your family to prioritize work over them.
Blaine has been told that he must work overtime on Saturday and then his mom calls to invite him to a family reunion on Saturday.
Blaine wants to respond to his mom about coming over on Saturday.
Blaine tells his mom that he'll call in sick to work on Saturday and be there for sure.
Blaine tells his mom that he is being made to work overtime that day and that he can't come.
Blaine's mom is delighted to hear Blaine will attend and is excited to see her son.
Blaine's mom is sad and feels that the reunion will be meaningless without Blaine there.