Poe's squad captured a First Order ship. Instead of a supply ship they were initially led to believe, it was an Academy ship carrying children. Amongst them were kids that looked like known FO officers and Knights of Ren.

Snoke had a giant breeding program going on to make more future soldiers. Kylo Ren and General Hux both have at least three hundred kids each, all lab-grown.

Leia looked at her potential grandchildren, already indoctrinated at a young age, as well as the offspring of known sociopaths and killers, and was wordless.