Big Brother Is Coming, Pt. 2

S1 E15: A wary Grace (Debra Messing) tells Will (Eric McCormack) of her romance with his brother, Sam (guest star John Slattery), and unleashes an avalanche of resentment. While Will wrestles with sibling rivalry, Karen (Megan Mullally) helps Jack (Sean Hayes) come to grips with turning 30 by hiring him as her personal assistant and leads Grace to sort through her true feelings for the Trumans.