Thunderbirds a lost sister

Years ago before Jeff tracy my son dissapeared I had six grandchildren but when Jeff dissapeared that day so did their sister, who was the youngest of the bunch. She was a mix of all the boys. She was responsible like Scott, smart like John, patience like Virgil, humorous like Gordon, enthusiastic like Alan but most of all she was kind soul and a badass just like her father. The boys where to young to remember her and strangely all of the photos of her dissapeared when she suddenly dissapeared. With each day passing with no sign of them I'm starting to lose hope. Until one day a girl they rescued from an island appears and acts and looks just like her. Coincidence?