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They are the dukes of Montpensier at San Telmo gardens, with their three elder daughters: Isabel and Maria Amalia, and baby Cristina.
And this is a picture of Isabel with her husband Philippe and their children. From left to right: Helena, Louis Philippe, Philippe count of Paris, little Louise, Isabel countess of Paris, Ferdinand and Isabelle. The picture was taken when they were on holidays at Villamanrique de la Condesa.

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Given the age gap, I would say the girl on the left is Pss Amélie, later queen of Portugal.
She had a more plump figure than her skinny sister Hélène.