Leia and Mr Jones appeared in one of the episodes where Dr. Kenzo Tenma and Dieter tried to hitch a ride to Freiham. The old English couple is seemingly on a "vacation" in Germany some time after Mr. Jones' retirement from his previous occupation as a policeman. When Leia sees Tenma and Dieter on the side of the road, she persuades her husband to stop and let them ride with them, despite Jones' reluctance. However, when their car runs low on fuel and Tenma leaves alongside Dieter promising to return with help, the couple does not anticipate it when Tenma and Dieter arrive with borrowed jerry cans after walking down the road several hours later. Thereafter, the couple treat Tenma and Dieter to dinner at a restaurant, where Tenma recommends that they order a bottle of ungeheuer wine.
Though Mr. Jones, in contrast to his understanding wife, exhibits strong suspicion about Tenma throughout his appearance due to his intuitions as an ex-policeman (similar to Inspector Lunge), it is revealed that Mr. Jones has reason to doubt his intuitions when the group makes a diversion to visit Steinbach Castle and, after reminiscing that their son Robert wrote fondly of the location's beauty in a letter, sadly relates that Robert murdered someone there. After parting ways with Tenma and Dieter, the couple embarks to Stadelheim Prison in Munich where Robert is imprisoned. Before entering, Mr. Jones reveals to Leia that he knew Tenma was a fugitive after their earlier visit to the police station but believes he is innocent, as he wants to believe about Robert.
(Source: Monster Wiki)
