Geillis and Dougal's son was adopted by a family in Cranesmuir, and he grow up to be William Buccleigh MacKenzie, also known as Buck.
He was the illegitimate son of Dougal MacKenzie and Geillis Duncan.
In Outlander Season 3, Episode 13, Geillis gives Claire a quick rundown of the events that happened. Geillis gave birth to the baby, who was given to William John and Sarah MacKenzie, the couple whose baby had been “taken by the faeries.” After that Dougal was able to smuggle her out.
In Scotland in 1968, Claire tells Roger Wakefield that Geillis Duncan was his ancestor and that she was burned as a witch in 1743.
William Buccleigh was born in December 1743 to Geillis Duncan, an accused witch and murderer. As she was condemned to die, William was taken to be raised by another family who had recently lost an infant, and they gave him the dead child's name, a common practice at the time.
Finally we discover how she survived: Because she was pregnant, they didn't burn her straight away. Dougal, bless his foolish soul, came to get the baby and helped her escape.
Geillis' Duncan's Death in the Books
Of course, Claire doesn't know that yet (in the books or the series). Instead, she simply gets a vague feeling of being connected to the bones, and that the woman didn't want to die when she did.
Like Claire, Geillis Duncan was also a time traveler. Geillis was constantly questioning and probing Claire for more information; it was as if she knew Claire didn't belong in that time period. During the witch trial portion of the series, Geillis finally understands that Claire is from the future.
Geillis Duncan (Buck's mother and Roger's many times-great-grandmother) comes back into play and performs some kind of sex act with Buck (the time-traveling version of her as-yet-unconceived son).
“He's about 25,” Gabaldon said. It's an interesting response. If you're up to date on the series, then you know that Jamie is not dead at the age of 25.
It's possible that Amelie's sister is the one who gives birth to the line that leads to Claire. Fergus will still be an ancestor but not a direct ancestor and that would mean Laoghaire isn't one of Claire's ancestor.
Following Aaron Beardsley's death, her mother Fanny gave birth to her while traveling to Brownsville. Knowing the child was half-black, Fanny abandoned her newborn daughter, fearing the repercussions of her adultery.
Does Claire know? Yes, Jamie told her after they finally reunite in the Print Shop in Edinburgh.
With the impending arrival of the Duke of Sandringham, Dougal returns to Leoch with Jamie and Claire. Not long after they arrive, Dougal gets word that his wife Maura has passed away of a fever at their estate of Beannachd.
“I curse you. I curse you with knowledge, Jack Randall. I give you the hour of your death. Jonathan Wolverton Randall, Born Sept 3rd, 1705, dies…” she whispers in his ear, and suddenly he knows that she's telling him the truth.
Margaret's vision produces the following information: "When twice 1,200 moons have coursed, 'tween man's attack and woman's curse, and when the issue is cut down, then will a Scotsman wear a crown.” To put it simply, it's Brianna, the baby who was born 200 years after she was conceived.
It's kind of too early for Claire to discover Geillis, and in the books by the time they meet, Claire already knows that Mrs. Abernathy is responsible for Ian (and other boys) being kidnapped. Also, Geillis has definitely aged and is suffering from syphilis, so there's that as well.
Ian survives because he is not a virgin, but is sexually assaulted by Geillis who drugs him and rapes him. Eventually, Jamie and Claire rescue Young Ian at the end of Season 3, and they all move to Fraser's Ridge together in Season 4.
This involved the use of pilliwinks (thumbscrews) on her fingers to gradually crush them and binding a rope and around her head and gradually crushing it by wrenching. Despite this torment, Duncan would not confess to anything.
It turns out that after recreating ether, an early form of anaesthetic, in the era she now lives in with Jamie (Sam Heughan), she's begun to self medicate to help her sleep.
Claire will need to explain genetic mutations in Outlander
He thinks that if he could have stopped that, the baby would have been born average. Claire knows that's not the case. Dwarfism is a genetic mutation. Sometimes it's in the sperm and sometimes it's in the egg.
Faith Fraser was Claire and Jamie's stillborn first child. She was born in Paris, France, following a dangerous pregnancy. Mother Hildegarde had her buried in the cemetery at L'Hôpital des Anges.
Dougal kept a close eye on the two women during their time at Castle Leoch. On whether he thought Claire and Geillis were time travellers, actor Graham, 61, explained: “Yes, I do.”