Jeremiah “Jemmy” MacKenzie is the son of Brianna and Roger MacKenzie, though believed to be the biological son of Brianna’s rapist Stephen Bonnet.
Jemmy is drawn to gemstones because of a noise they make. However, when playing with Claire’s opal (Otter Tooth’s); he claims it is hot. Brianna, Roger, and Claire feel it’s warmth though Ian and Jamie do not. While holding the stone it breaks apart causing a sound much like the standing stones which only travelers can hear.
Brianna believes Jem must be Roger’s child and he has the time traveling gene from both his parents for it to be so strong as to break a gemstone.
