Ralston is one of Ned's two half-brothers, who first appeared (as small children) unnamed with his brother Maurice and their father and never-named mother in "Girth". They would later return in "Dim Sum, Lose Some" and "Oh Oh Oh...It's Magic". Given his age, Ralston was clearly born before Ned's mother had died and he (Ned) was abandoned by his father. The twins are not any significant part of events in the second half of the second season, and are not seen in the conclusion montage in "Kerplunk".