First, sorry for my English, it's not my native language.
As the title suggests, I wonder if Samos adopted Keira in the past. Keira is known to be a year younger than Jak, but when Jak was sent back in time he was estimated to be five to six years old, perhaps a little younger. So how can Samos be Keira's father if Jak and Keira's age difference would be so big if Samos had fatherd his daughter in Sandover Village?