The Gilded Age · A Viewer's Companion
Nobody in this show is at war with a sword — the weapons are dinner invitations, opera boxes, and marriages, which makes it easy to lose track of who actually belongs to whom. This chart splits the cast into its three households: plum borders are the old-money van Rhijn–Brook house, gold borders are the Russells, the railroad millions across the street, and teal borders are the Scotts, the Black elite family whose world runs on its own rules entirely.
Nobody here is secretly anyone's father. The tangles are all about money, names, and which side of the street you were born on.
Old New York (Mrs. Astor's set, the Academy of Music, the van Rhijns) believes position must be inherited. The Russells' railroad millions are barely a generation old, so society pretends they don't exist. Every battle in the show — the ball, the opera boxes, the duke — is the Russells forcing the old guard to open the door or be replaced.
For two seasons Agnes pays for everything with her late husband's van Rhijn fortune and never lets anyone forget it. Then Oscar loses it all to a con artist, and meek Ada — widowed after one married season to Rev. Luke Forte — discovers he left her a fortune. From Season 3 on, the sister who never got a say holds the purse, temperance pledges and all.
Marian is the daughter of Henry Brook — Agnes and Ada's estranged brother — who dies before episode one and leaves her penniless. That makes her the aunts' niece, a Brook by name with no money of her own, planted in an old-money house while falling for the heir of the new-money one: by Season 3 she's engaged to Larry Russell — off, then on again.
Season 1: Bertha's ball finally forces Mrs. Astor through her front door. Season 2: she splits society in the opera war and wins — her new Metropolitan beats the old Academy. Season 3: she marries Gladys to Hector, Duke of Buckingham, the ultimate trophy — at real cost to Gladys, and to Bertha's own marriage to George.
Peggy writes for a living and works beside Marian at the van Rhijns', but her family needs nothing from that house: her father built a Brooklyn pharmacy business from nothing, and her mother presides over Black society. In Season 3 the Kirklands of Newport arrive — the eligible Dr. William, and his mother Elizabeth, whose snobbery about the Scotts' skin tone and self-made money mirrors Mrs. Astor's exactly.
Bertha's ladies' maid Turner spends Season 1 scheming — including a bid for George himself — and gets fired. She resurfaces married to a rich old man as Mrs. Winterton, with an opera box, a society wardrobe, and every one of Bertha's secrets in her pocket. Watch the strip below: same face, new name.
Three surnames, two butlers, two social queens — here's how to keep the look-alikes and sound-alikes apart:
Agnes and Ada were born Brooks — genteel but poor. Agnes married into the van Rhijn money; Ada and Marian stayed Brooks. The Russells are no relation to any of them — just the staggeringly rich strangers across the street.
The two aunts. Agnes (Christine Baranski) — married money, rules the house, rations approval. Ada (Cynthia Nixon) — never married until Season 2, apologizes on her way into rooms… and ends up the one with the fortune.
The two sons and heirs. Oscar van Rhijn — old money, hunts an heiress to fix the family ledger, hides his private life. Larry Russell — new money, works as an architect, and proposes to a penniless girl because he wants to.
The two butlers, one per mansion. Bannister runs the van Rhijns'; Church runs the Russells'. They feud on their employers' behalf — and once, scandalously, Bannister moonlighted across the street.
Mrs. Astor is the real queen of society — her invitation list decides who exists. Mrs. Winterton is Bertha's fired ladies' maid impersonating that class of woman, thanks to a rich elderly husband.
Everyone just says the Duke: he's Hector, Duke of Buckingham — the trophy Bertha snatched from Mrs. Winterton's dinner table in Season 2, and Gladys's husband by Season 3.
The two young women who meet on a train platform in episode one. Peggy Scott — a professional writer who took the secretary job at the van Rhijns' on her own terms. Marian Brook — the penniless niece the house is obliged to keep. Friends across a line the show never lets you forget.

Caroline Astor — the arbiter of old New York. Her ballroom list is the border of society, and Bertha's whole campaign is aimed at it.

Bertha's scheming ladies' maid, fired in Season 1 — back in Season 2 married to elderly money, with an opera box and a grudge.

The van Rhijns' butler and keeper of the old ways — who knows exactly which fork is wrong at the Russells' table.

The Russells' butler — steering a brand-new household through rules its owners are still learning.

The van Rhijns' young footman who invented a better alarm clock — and in Season 3 sold the patent, walking out of service a rich man.
A note on the portraits: these are the characters as they appear on screen — stills from the Gilded Age wiki, cropped and served from this site so nothing loads from anyone else's servers. Chart and text reflect the story through the end of Season 3 (aired June–August 2025) — spoilers to there, and nothing beyond.