
Half-sisters Mona and Dee Dee are virtual strangers who have grown up separately and suddenly become neighbors in the same San Francisco apartment building. Mona is a budding music executive raised by her single mother to be free-spirited and independent. By contrast, younger Dee Dee is a privileged honor-roll collegian who grew up in a two-parent home but seeks her identity out of the shadow of her overbearing mother.

While attempting to help Mona get over her recent heartbreak, Dee Dee unintentionally drives her into Spencer's arms; Phyllis brings her new boyfriend (Louis Gossett Jr.) to a family dinner.

Mona buys a horse on the Internet after learning about Dee Dee's, but she believes she has been cheated when the horse trainer (Rupert Boneham) arrives.

When Mona is offered a different job at another record label, she must decide whether to stay or move on.

When Big Dee Dee crashes Phyllis' charity telethon meeting, Phyllis loses it and tells everyone that Big Dee Dee was pregnant before she married Charles.