Blair's mother is scheduled to have plastic surgery but calls it off to make a visit to Eastland to see her daughter. However, a mistaken phone call leads Blair to discover the truth, her mother may have breast cancer.

Graduation has everyone rushing around and Natalie and Tootie are worried that their isn't going to be enough time for Jo and Blair to say goodbye, especially since Blair and Jo are at each other's throats, as usual.

As graduation day arrives, Monica is furious that Blair's father won't attend, Rose is furious at Charlie due to his sudden tranformation into a big spender and Natalie and Tootie are scared that they will lose Blair and Jo as friends when they leave for college.

During an alumni weekend at Langley, Blair's mother and Jo's father bond which leads to Blair and Jo's fears of becoming sisters.

Needing advice on her love life, Blair asks her mother to visit, only to learn that mom needs advice even more than Blair does.

A very pregnant Monica comes to the house on Christmas Eve, where she ends up in labor and gives birth to Bailey, her third child, on Christmas morning.

After her commencement speech is rejected, Jo refuses to make a speech at all, but then learns that her grandfather has come all the way from Poland to hear it.

Babysitter Blair leaves her sister with the others while she attends a tea, and returns to find they somehow misplaced her.