Mrs. Gold is Ari's wife and her first name is never given.  She comes from family and gave up her acting career to be a full time Hollywood wife and mother.  She is definitely the only one who can control Ari.

Mrs. Gold Quotes

Mrs. Ari: You are such an asshole.
Ari: I'm the asshole that pays for your art lessons and gets celebrities to attend your charity events, and supports your deadbeat brother.
Mrs. Ari: Hey little agent boy, you better be back here for the cake.
Ari: Okay

Ari's Wife: Could I have the car keys please?
Ari: Come on! There's a cab stand at fucking Yawnka!
Ari's Wife: Give me the fucking keys!
[Ari hands over keys]
Ari: Drop me off