However, after some convincing from his sister Jenny Murray (Laura Donnelly), Jamie married Laoghaire. Sadly, their relationship didn't work out and before long she moved out with the pair estranged.
Facing a life without Claire, Jamie married Laoghaire in 1764 so he could be a father to the girls, since he never got the chance with Brianna or Willie (Clark Butler). However, the marriage didn't last long and Jamie ended up leaving. When Claire returns in 1766, Jamie and Laoghaire's marriage is declared in invalid.
Jamie has a son named William Ransom with Geneva Dunsany, who died during William's birth. Jamie also has two stepdaughters, Marsali MacKimmie Fraser and Joan MacKimmie, from his marriage to his second wife, Laoghaire MacKenzie.
Outlander viewers will remember how besotted Laoghaire was with Jamie in the first season of the show. She became so jealous of his interest in Claire, she was driven to some extreme measures to try and make him hers. This included trying to curse Claire with a doll as well as accusing her of witchcraft.
Basically, he married Laoghaire because he liked her kids and was feeling alone. For what it's worth, the marriage didn't exactly work out because we all know that Laoghaire is the absolute worst. In fairness to Laoghaire, it is understandable why she fell in love with Jamie Fraser.
Nonetheless, Jamie did have sexual relations with Laoghaire in a bid to make the marriage work but ultimately failed and so the couple separated. Additionally, it seems Jamie was acting of out duty to his new wife however past trauma meant Laoghaire was unable to reciprocate.
The writers of Outlander made a big change to the series from the source material in season three. In the third outing, Jamie Fraser (played by Sam Heughan) tied the knot with Laoghaire MacKenzie (Nell Hudson) during the 20 years while Claire (Caitriona Balfe) was in the future.
Unable to sleep, Claire heads to Colum's library to borrow a book, and ends up eavesdropping on a conversation between Colum and Dougal. She discerns that Dougal has gotten Laoghaire pregnant.
Some think Jamie's spirit (but not his body) traveled to through time to guide Claire to him; others suggest Jamie had a near-death experience after the Battle of Culloden, and that's why his ghost is 25 when he appears to Frank.
Claire gives him a beautiful, tender answer: she shares his regret, but regret is not enough. And together they make the decision to give the baby to Lucinda, a young mother who lost her own baby at birth, and has both love and milk in abundance.
IAN MURRAY THE ELDER
And Ian, played by Steven Cree, is a warm and welcoming presence after Laoghaire's bitterness. He accepts immediately that Brianna is Jamie's daughter–even though Jamie never mentioned her.
Claire Meets Jamie's Son and Saves Lord John Grey on Outlander - Outlander Season 4 Episode 6.
There are no biological children after Brianna in Outlander
Claire and Jamie don't have any more children after Brianna. Claire heads through the stones while pregnant with Brianna at the end of the second season/book. She spends 20 years in the 20th century, and she and Frank don't have any children together.
This one stings.
Jamie & Claire (Season 3, Episode 6)
After years spent apart through space and time, Claire finally tracks down her Highlander hubby. Following a brief fainting spell upon catching sight of his wife, Jamie recovers enough to learn that his long lost love has returned to him.
Just as she begins to worry that Jamie might be capable of lying to her, Jamie quells her fear by revealing to her his indiscretion with Mary MacNab, a woman who worked at Lallybroch, while Claire was back in 1968 with Frank and Brianna. This confession soothes Claire, and the two find themselves realigned once again.
Jamie can't time travel in the world of Outlander
Jamie Fraser doesn't have the time-traveling gene. In the books, we find out that Brianna and Roger's daughter, Mandy, can see people as certain elements, and Jamie is water. Those she sees as water don't have the ability to time travel.
Jamie denies having slept with her, but the damage to his and to Claire's reputation is done—and the bond between the Frasers and Malva is severed, until just a few weeks later, when Claire finds Malva murdered in the garden.
In the first season, Dougal picked Jamie to marry Claire so that the British army could not lay hands on her.
William Buccleigh MacKenzie is the illegitimate son of Dougal MacKenzie and Geillis Duncan, and was raised by William John and Sarah MacKenzie.
Mary Hawkins' baby was that of Alex Randall, with her and Jack only marrying to ensure Mary was provided for after Alex's death. But that didn't make Mary and Black Jack Randall's wedding valid. If you remember back to “The Wedding,” Jamie made it clear that he and Claire had to consummate the relationship.
In Season 1's “Castle Leoch,” Jamie takes Laoghaire's punishment for “loose behavior” and it lands him with a variety of contusions and lacerations meted out by Rupert.
Claire learns why Jamie married Laoghaire in Outlander Book 3, Chapter 37.
Claire technically has three husbands when you read all eight current Outlander books.