Blaise's parents were members of the Imperial Legion but both were killed in an ambush. After his parents were killed, Katla took him in and put him to work as her stable boy ( my add he continuously sleeps outside in the snow that's where he sleeps) he does hard work for those who took him in even in the snow.
sofie nHer mother died when Sofie was young and her father was a Stormcloak soldier who was killed in battle. The Dragonborn has the option to adopt her through the new adoption mechanic. again sleeping outside next to a barrel.
I've already adopted lucia so out of these two which one should i adopt