After defeating a bunch of white supremacists, a rogue IRA member took Jax’s son and hightailed back to Ireland. After pulling a few strings, the Sons were on their way to the Emerald Isle as well to get Jax’s boy back and settle some scores. SAMCRO isn’t alone, they’re being helped
by their Irish chapter SAMBEL, and a young lady Trinity, who’s taken a shine to Jax.
Gemma realizes that Trinity is actually John Teller’s daughter with a woman he met in Ireland, making Jax and Trinity siblings. She doesn’t tell either of them - but Trinity and storyline thread of Sons founder, John in Ireland are never brought up again.