Grace's visiting mom, Bobbi Adler, a would-be star whose propensity for breaking out into show tunes and impressions dismays her daughter – and delights Will, Jack and Karen – wreaks havoc by suggesting Will and Grace wed, despite their sexual differences. When Will winces at the fantasy of committing to anyone who needs to be the star of a relationship, Grace realizes she's more of a chip off the old block than she imagined.

Grace is jealous when her mother stops match making for her, and instead sets Will up. Jack must convince an INS agent (who he dated once) that he and Rosario are happily married.

In a flashback to Thanksgiving 1985, coed Grace invites her college boyfriend Will home to meet her family, but their romantic relationship swerves dramatically when a conflicted Will phones a teenaged Jack for some crucial advice. Unfortunately, Will and an angry Grace end up temporarily estranged when he blurts out the truth and she orders him out of the house -- and her life.

In a flashback to Thanksgiving 1985, coed Grace invites her college boyfriend Will home to meet her family, but their romantic relationship swerves dramatically when a conflicted Will phones a teenaged Jack for some crucial advice. Unfortunately, Will and an angry Grace end up temporarily estranged when he blurts out the truth and she orders him out of the house -- and her life.

Rather than be apart on Thanksgiving Day, Will and Grace join Jack and Karen for a festive holiday motor tour of their respective dysfunctional families, including Grace's domineering mother as well as Will's willful mom and Jack's stepdad -- with unsettling results. Meanwhile, back home, a waiting Rosario bastes and tastes their juicy turkey.

This episode is also known as "Thanksgiving." Will and Grace join Jack and Karen in a motor tour of their respective families. (Double-length Episode)

Grace and Leo impetuously take their vows at a Central Park wedding that is a ratings stunt hosted by Today's Katie Couric. Grace's pals, especially Will, are hurt that they weren't invited, but all seems forgiven when everyone including Grace's outspoken mom and the subdued Mrs. Marcus gather days later for a swank reception. It should be a festive bash, but the emergence of unsettling details about Leo and about the park nuptials give Grace reason to wonder whether she has made a mistake.

Grace's wedding to Leo leaves Will feeling upset over losing his best friend.

Opting out of the annual Grace Adler Design Christmas party, ultimate ""Fanilow"" Will spends the night waiting in line for tickets to a special Barry Manilow concert only to have his weak bladder force him to make a quick pit stop and entrust Grace to hold his place. However, Will's snubbing of an overweight man in the bathroom line leaves his chances of meeting his idol in doubt. Meanwhile, a distraught Grace discovers her mother has cancelled on their annual Hanukkah shopping spree to have dinner with Jack. And Karen is embraced by the inspiring music of Manilow waiting in line with a Fanilow named Cheryl.

When Grace convinces Karen to accompany her to her father Martin's birthday bash, the situation turns awkward when it is just the three of them. Struggling to gain the attention of her seemingly aloof father, Grace tags along with him to the golf range in hopes of scoring some quality bonding time. Meanwhile, Karen keeps herself entertained with Martin's buddy, Burt. Meanwhile, excited about the date that Jack has arranged for him, Will discovers the true meaning of the phrase ""blind date.""

Grace finds it impossible to put up with her mother Bobbi’s constant nitpicking, so Jack takes it upon himself to help her because, according to him, no one knows how to be a good daughter better than a gay son.

The big day has finally arrived - Grace and James are getting ready for their green card wedding. To Grace's dismay, Karen takes it upon herself to ignore her wish for a low-key wedding ceremony and decides to arrange including hiring Hall & Oates.