Stacey visits Thomas and Cathy, who have an open marriage and live a polyamorous life, sharing their home with Nicole, who is a part of their relationship.

Stacey spends a weekend with the Saccone Jolys, one of Britain's most popular YouTube families. They have four kids who have been in videos since they were born.

In Brighton, Stacey stays with Matt and Adele and their three children, 8 year old Ulysses, 4 year old Ostara and baby Kai. Adopting childled parenting, Matt and Adele believe that kids don't need rules – just freedom to choose how they live and learn. They co-sleep with their parents, do not attend mainstream school, decide what they eat and when they eat, have no fixed bedtime and the parents are against mainstream medication.

Stacey travels to Preston to spend time with a family who have encouraged their teenage son, Kyle, in his amateur career as an MMA cage fighter since the age of four. Kyle is now 14 and home schooled, so he can concentrate on his fighting. Stacey goes to watch Kyle in a big cage fighting competition - where he will be fighting in front of a large crowd - to see if he has what it takes to be a champion and Stacey questions whether it is right to put your child in the cage.

The Preston family from Ashton-under-Lyne are members of the Jesus Christ Church of the Latter-day Saints, or more commonly known as Mormons. Eldest son of three, Adam, is seventeen and deciding whether to become a missionary for two years. Stacey joins the family, and finds out what it’s like to grow up with the strict parenting code of the church - including no tea, coffee, alcohol, and strictly chaperoned dating.

Stacey visits a wealthy family in their manor house in the Warwickshire countryside, challenging their views on privilege, inherited wealth and private education.

Felipe and Lillian have created a home life that follows the extremely traditional lifestyle or 'tradlife'. Putting her career ambitions to one side, Lillian has become part of a growing movement of 'tradwives' - meaning she prefers to take a submissive role in her marriage to husband Felipe. As head of the household, Felipe is responsible for providing all the family income; while Lillian's role is to be a 1950s-style housewife, cooking, cleaning, ironing, home-educating their two young children and deferring to "the boss" in all decisions.

Professional model Keisha and Nigerian millionaire Kunle have two children together. Their youngest, Dior, is the epitome of a star of the future; forthright, articulate and bubbly. This young girl is following in her mother's footsteps and is already well on the way to becoming a successful model - a career path she first embarked on when she was still only three years old.

Environmental campaigner and aristocrat Roc purchased the remote Hebridean island of Gometra 25 years ago and moved into a derelict house with his four children. Gometra has been his main residence ever since and he spends the majority of his time living there. Roc and his children, Blue, Savannah and Lazer, are staunch environmentalists and regularly make a 17-hour journey to London (involving an eight-mile walk, two ferries, two buses and three trains) to help lead the controversial Extinction Rebellion and HS2 campaigns.

29-year-old Reece has always loved animals and grew up surrounded by horses and domestic pets. But this didn't soften the shock to Reece's family four years ago when, right next to the family home in the quaint village of Strelley in Nottinghamshire, he installed a cage full of big cats. Since then, his collection of exotic and dangerous animals has only expanded, and his menagerie now includes two lions (Rocky and Rora), a puma (Rogue), 26 squirrel monkeys, two wallabies and a capybara.

Rabbi Mordechai and his American-born wife Blima are parents of nine children, aged between one and 16. As members of the Hasidic Jewish movement, Chabad, they live a strictly Orthodox Jewish lifestyle at home, adhering scrupulously to ancient rules covering everything from diet to marital relations. But theirs isn't an inward-looking or isolated life: Mordechai ministers to a congregation of 800 families across the community with various levels of observance.

Welsh couple Dom and Kellie weren't fully prepared for the challenges that they would face when their two sons, Lucus and Alexander, were diagnosed with Down's Syndrome and cerebral palsy respectively. Their eldest daughter, Isabella, used to get upset by how frustrated Lucus would become as he struggled to communicate, so she learned Makaton sign language, and it became part of the family's everyday life. 13-year-old Isabella and her brother have now become social media stars - as they share their relationship and teach Makaton to her fifteen thousand YouTube subscribers.

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We spend the weekend with 23-year-old Lily Phillips, a high-profile adult content creator who has sparked both fascination and outrage in equal measure.

We meet Barrie Drewitt-Barlow, Britain's first legally recognised gay father, entrepreneur and outspoken supporter of commercial surrogacy - which is banned in the UK.

We meet single mum-of-eight Marie Buchan, a lightning rod in the fierce debate over the UK benefits system who has openly shared her state-funded lifestyle.