This is the only known picture of the Goshan Twins before their time in Fleet, from near their home estate-compound on Caprica, taken by a hidden, back-up, stand-alone security system overlooking the emergency egress tunnel. Dated CY47.

Forensic assement teams sent in determined that all 539 other personnel on-site at the time were killed by a pair of assailants, using firearms, melee weapons, hand-to-hand combat, poisoned food, various objects improvised as weapons (including devices of an
intimate nature and spoons), clothing (including lingerie), other personnel (including various detached limbs used as clubs and spears), household pets, landscaping, architectures, drowning, and at least one due to exposure (locked inside a deep-freezer). There are indication at least six people died of over-stimulation of their pleasure centers (assessed to be through
intimate acts causing either strokes or heart attacks) and another three from fear (again, causing either strokes or heart attacks). Colonial Intelligence had plans to apprehend and interrogate the two, but were overriden by
<<REDACTED>>. Due to genetic testing revealing that no one inside the compound was remotely genetically related to the twins (including their birth-parents of record), Intelligence is no longer as concerned with the status as 'free agents', especially given their so-far exemplary service in the Fleet. Intelligence has yet to identify the purpose of the genetic testing equipment inside the compound's basement.
Further research also determined that "Goshan" was a multi-generational alias; the family had not existed--despite records noting otherwise--before the Cylon War. It comes from Ancient Caprican, with "Go" shortened from "Gozrak", meaning "an even blending of light and dark" (alternately, "an equal blending of white and black"), and "shan" directly translating into "cut solid rock". The motive behind this specific alias is unknown.