Agnes is disappointed when she discovers she is not invited to Maria's hen party because she is too old, so she and Winnie decide to crash the event, but end up in the wrong venue. She invites Maria's mother round for dinner and is so nervous about impressing her that she gets drunk and the evening descends into chaos.

Dermot's pre-marriage nerves get the better of him and he locks himself away in a cupboard, so it is up to Agnes, Fr Quinn and best man Buster to try to calm him down. Meanwhile, Rory tells his mother he is gay.

All over Dublin, mothers are excitedly looking forward to seeing their loved ones return home for Christmas. But Agnes Brown is depressed. Her son Trevor is on the missions in Canada, and can't possibly afford to make it back. With Maria's posh mum Hillary pressing the newlyweds to spend Christmas at her place, Agnes decides to compete for their love by providing an even more lavish Christmas celebration than Hillary's - even if Buster is having trouble delivering the turkey.

Baby fever hits the Brown household as a pregnant Maria prepares for motherhood, and Agnes is keen to give her new daughter-in-law her unique brand of advice about raising children. Maria is grateful when Agnes offers to look after the robot baby she has brought home from her pre-natal class, but it turns out that Mrs Brown's babysitting techniques are not exactly orthodox. And Maria has some exciting news for the Brown family.

When Agnes's family start making comments about her weight, she decides to go on a diet, and quickly discovers just how difficult it is to overcome her craving for fish and chips. Cathy brings her new, older man home. He is a psychiatrist, and seems much more interested in Agnes than he does Cathy. Meanwhile, Rory has a professional dilemma when he discovers some illegal drugs at work.

There is bickering aplenty in the Brown household, as Rory and Dino are on the rocks and Agnes and Betty rub each other up the wrong way. With Maria about to give birth, Cathy convinces Agnes to build bridges and invite Maria's mother Hillary out for dinner. However, the night comes to an abrupt end when Maria goes into labour. Can the family get Maria to the hospital in time?

With the festive season fast approaching, Agnes Brown finds herself facing her busiest Christmas yet. Spiritual son Trevor is visiting from the missions, grandson Bono is sleeping over on Christmas Eve, and there are three new faces to feed on Christmas Day now that Agnes’s youngest son Dermot is the father of triplets. Visiting, priest Father Damien announces that the Finglas Nativity play has been cancelled. Agnes vows to stage a Nativity play of her own in the local community centre. She meets stiff resistance from Father Damien, who is wary of meddling mothers like Agnes and refuses to ask permission from the Bishop. Cathy is furious when she discovers that Agnes has been reading her mail and decides to play a prank on her interfering mother. Convinced that she has been entered into a ‘Best Christmas Mother’ competition, Agnes starts being unusually nice to everyone...

Agnes Brown has finally been given permission to stage her own Nativity play and is determined to put on the greatest show on Earth. The only thing standing in her way now is local priest Father Damien, who is insisting that Agnes makes some last-minute changes to her rather unusual script. Will Agnes ever get to play the Virgin Mary?

Agnes is desperate for a holiday but cannot find anyone to look after Grandad. It seems her only option is to convince a health inspector that Grandad is losing his marbles. Sparks fly when Rory and Dino move into Mrs Brown's house, and Agnes' late husband Redser gets in touch from beyond the grave with some very ominous news...

The Browns are excited as preparations for Rory and Dino's big day are in full swing - although Agnes's mood is dampened when she meets flamboyant celebrity wedding planner La La Doggy. The foul-mouthed matriarch also clashes with Father Damien when he raises some religious concerns about the ceremony - and to top it all off, she gets more than she bargained for when she invites Cathy's boyfriend's parents over for the evening.

Agnes prepares for her New Year's Eve party although half the guests have reasons for not coming to it. She is also perturbed that Mark and Betty want to send Bono to the very rough local school and is somewhat harassed when stern Father McBride persuades her to look after a parrot that belonged to Maria's recently deceased auntie. After having a mishap with some aerosol glue which she mistook for deodorant and accidentally bringing on Dino's food allergy Agnes learns that the parrot was living in a house of ill repute not unknown to Father McBride, a fact which comes...

Winnie drops a Christmas bombshell. Maybe her unusual new Christmas tree will bring Agnes some festive cheer?

Agnes's Christmas may not be a happy one with Grandad unwell, Rory's salon catching fire - requiring a pop-up hairdressers in Agnes's front room - and Buster and Dermot facing opposition for a pet shop contract from a rival team of advertisers. Furthermore she is determined not to have a Christmas tree - as it is dangerous. However when Christmas comes round Grandad makes a miracle recovery, thanks to an accident to Agnes due to a forest of Christmas trees supplied by Buster, who has also secured the contract. Everybody gathers in the pub to celebrate with a quiz and a karaoke.

Cathy has a new, French boyfriend. He doesn't make the best first impression, which might be an issue if he is to survive meeting Mrs Brown.

Grandad is convinced that the house is haunted.Cathy has a new internet date, Agnes has been given a special Christmas tree to cheer her up and Rory has had plastic surgery.

Damien McKiernan made his debut as Rory Brown in Christmas special Mammy's Mummy.

When a crime wave hits Finglas, Father Damien and Maria put together a neighbourhood watch scheme.

Everyone in the Brown household is concerned at the news that the poisoner Peggy Piper has been released from prison, Winnie especially.

It’s Christmas in Finglas, and Mrs Brown is coping with life after lockdown. As she gets news of a very special competition, Grandad, Winnie and Father Damien come to her for help.

The Browns get a visit from Uncle Micky, who is fresh out of prison with a new scam up his sleeve. Meanwhile, Winnie tries to liven up her life with some daredevil stunts.

Suspicion surrounds Cathy’s creepy boyfriend, Boris. Buster and Dermot are convinced he is a vampire and hatch a plan to save Cathy, which leaves her mortified. Sharon has boyfriend troubles of her own, and Father Damien has been called away to tend to some depressed chickens. Meanwhile, Buster convinces Agnes she should have her antique vase valued. Who knows how much it could be worth? After all, it has been handed down through generations, and she plans to leave it to Cathy as her inheritance.