As of July 2026, My Three Sons Season 12 aired in 1971 with 24 episodes — streaming now on Philo. Full episode guide and where to watch below.

My Three Sons Season 12 poster

← Back to My Three Sons

My Three Sons Season 12

1971 24 Episodes Comedy · Family ⭐ 7/10

My Three Sons Season 12 has quietly become one of the more dependable comedies currently available on . A compact run that never overstays its welcome. A 7/10 rating says what the writing already makes obvious: this one works. Fred MacMurray's performance alone is worth the time investment. Put it on tonight and see for yourself.

Whatever else is competing for your attention this week, My Three Sons Season 12 is worth clearing space for. Sharp writing and a well-matched ensemble are what separate My Three Sons Season 12 from the crowd. Season 12 of My Three Sons includes 24 episodes. It aired from September 1971 to April 1972. This season stars Fred MacMurray, Don Grady and Stanley Livingston. Fred MacMurray and Don Grady lead a cast that brings real weight to the material. It was aired in 1971. The real test of any comedy is whether it is still funny once you know all the jokes, and My Three Sons Season 12 holds up on rewatch in a way that separates it from one-off curiosities. There is real craft here, even in the moments that do not fully land.

Comedy fans looking for a reliably funny watch will find it in My Three Sons Season 12. It does not lean on comparisons to make its case. A contained run means every episode is doing real work. Fred MacMurray's comic timing carries it through its weaker moments. The kind of comedy you recommend to someone who claims they do not watch much.

📡 Where to Watch My Three Sons Season 12

🇺🇸 United States

🎬 My Three Sons Season 12 — Episode Guide

The Advent of Fergus

Steve's look-alike Scottish nobleman cousin Fergus, comes to America looking for a bride to take back to his hometown of Sithian Bridge and moves in on the entire Douglas family, much to the dismay of Uncle Charley.

Fergus for Sale

When Uncle Charley learns that Fergus is looking for a wife to take back to Scotland to provide him with heirs to carry on the family name, he takes out an ad in the local newspaper in an effort to rid the Douglas home of his nemesis.

Steve's Scottish cousin Fergus, after only one date with Bowling Alley Cocktail Waitress Terri Dowling, proposes but gets turned down by her. She feels inadequate to return to Scotland as royalty, but is eventually persuaded by Steve.

Goodbye, Fergus

The wedding day for Steve's Scottish cousin and bowling alley waitress Terri Dowling finally arrives amid the traditional confusion and tears. They leave for a three day honeymoon in Las Vegas but Uncle Charley is worried about the lack of thankyou from them.

Four for the Road

Having no choice, Steve takes the triplets to work where a secretary offers to take them home until he is finished. However he accidentally loses her details and when she finally rings, she announces that the boys have run out the front door, much to Steve's annoyance.

Polly the Pigeon

Chip complains about Polly's lack of sales resistance because they have an apartment full of useless things. But she is trapped by a salesman into giving a dinner party for eight people in exchange for a free set of cookware.

Happy Birthday, Anyway

Uncle Charley leaves for a week's vacation in San Francisco but meanwhile, birthdays disrupt the Douglas household, when Barbara, Katie and Polly turn against their spouses over the men's apparent oversight.

Childless young marrieds Chip and Polly Douglas suddenly find themselvs the temporary guardians of several young children including the triplets, when Katie flies to Peru for a weekend rendezvous with Robbie. Meanwhile, Steve, Barbara and Charley go on a camping trip and Barbara isn't exactly Mrs. ...

Barbara's natural enthusiasm bubbles over into an embarrassing evening for Steve and some of his business associates. Barbara explains to Steve that adrenalin gets her going in competition, and she is apprehensive when he is asked to play in his work's bowling team for fear she will make him lose c...

Katie Douglas takes a job singing in a small coffee house, but both Steve and Charley have their doubts about the man she is going to work for. After meeting the owner's wife, they realise she is in very good hands.

Polly's Secret Life

Polly fears that Chip is losing interest in her as a woman, and she takes some very dramatic steps to remedy the situation. Ernie gets the impression that the marriage is on the rocks when he finds out she is sneaking away from school and making mysterious calls to a man named Andre.

The Sound of Music

Uncle Charley is persuaded to fill in as a Cello teacher to a small group of reluctant young music students. His teaching methods leave much to be desired as he makes sure that they practice and practice for the upcoming recital.

Katie's triplets are spotted by a talent scout for a production company and are selected to appear in a television commercial. The temperemental Director yells when the boys misbehave and make a shambles of the studio. Grandfather Steve is asked to replace the actor doing the same so the boys will ...

Three for School

Katie decides to put the triplets in a nursery school during the day when she fills in for a friend as a secretary, a move that enrages Uncle Charley when he hears about it. Later, it becomes apparent that he goes missing every afternoon causing the family to worry.

A little first grader named Alfred develops a big crush on third grader Dodie Douglas -- much to her displeasure. When Uncle Charley invites him to dinner, Dodie tries to fake illness to get out of it. Very soon Alfred's mother reports that he is missing.

Buttons and Beaux

When the Douglas men feel sorry for Katie because of her husband's continued absence, they proceed to overwhelm her with attention by each one of them taking her out to the same restaurant each night.

Dodie commits the entire Douglas family to a time consuming project - the awesome task of getting a four foot tall bag of Peanuts into small little sacks which they hope to sell at the school fair to raise money for Korean orphans.

Bad Day for Steve

Steve suddenly becomes accident-prone when his youngest son Ernie tries to discover by graph and observation how the moon's lunar phases affect people's behaviour.

While Steve becomes pre-occupied with a time-consuming project named Taurus, Barbara blossoms forth as a Championship Cook. Her recipe for 'Tangy Tidbits' wins her a trip to Hawaii for the final cookout.

Bad Day for Barbara

Although Barbara is feeling very ill, she is saddled with the responsibility of looking after the entire Douglas household but in the end, to escape the pressure, she just walks out leaving Steve in a worried state.

🎭 Cast of My Three Sons Season 12

Fred MacMurray

Don Grady

Stanley Livingston

Stanley Livingston

Barry Livingston

Barry Livingston

William Demarest

William Demarest

Charley O'Casey

Beverly Garland

Beverly Garland

Tina Cole

Dawn Lyn

Dodie Harper Douglas

📋 All Seasons of My Three Sons

Season 1 Season 2 Season 3 Season 4 Season 5 Season 6 Season 7 Season 8

Never Lose Track of My Three Sons

TV Butler Pro lets you search every streaming service in seconds, tracks what you've watched, and works completely free. No app download needed.

🎩 Try TV Butler Pro Free