Winnie, Ian, & Terry Robinson, England 1944

Winnie, Ian and Terry Robinson in Winchester, Hampshire, England in about 1944 with "Louis from Maryland", who was here for D-Day, he possibly also knew their elder brother Denis who was in the RAF in WW11. Children's parents were Eric and Muriel Robinson, Eric was a prison Officer in Winchester Prison when this photo was taken. Looking for "Louis" (no surname) as he may have info that may help me find my biological father.

Who is "Louis from Maryland" ? The American serviceman in this photo, he was a friend of the Robinson Family during WW2, he probably knew Denis Robinson, Winnie's older brother, who was in the RAF during the war and died in a plane crash in 1947 in England.