Answer:
Well, because you have failed to provide any context here, I cannot answer with complete certainty. There is no one definitive correct answer.
> This is possible: (Beatriz es la hija de Pedro y Mabel.) .... assuming Pedro and Mabel are Beatriz's parents
> This is possible: (Beatriz es la abuela de Pedro y Mabel.) .... assuming Pedro and Mabel are Beatriz's grandchildren
> This is possible: (Beatriz es la nieta de Pedro y Mabel.) .... assuming Pedro and Mabel are Beatriz's grandparents
Step-by-step explanation: