El Niño and La Niña

On a trip to northwestern Peru in 1923 George and Neal both befriended and eventually married the Lopez sisters. The sisters gave birth to two children, simply referred to as The Little Boy and The Little Girl, in Spanish, El Niño and La Niña. After Neal and George were required to return to their present timeline (the time travel device only lets them stay in one timeline for a maximum of 2 years), their children were, understandably, upset. By the time George and Neal could return to their Peruvian families the children had grown disruptive. While most children are prone to throw tantrums and act out, George and Neal's children are responsible for storms and other weather anomalies in the Pacific Ocean to this day.