Luisa and mark are respected and obeyed by their grandchildren even though they see them only on holidays. they would be described as grandparents.

The correct answer is remote grandparents.

Remote grandparents refer to grandparents who only occasionally spend time with or interact with their grandchildren due to physical and/ or emotional separation. Grandparents might be physically and/ or emotionally separated from their grandchildren due to reasons such as living far away from each other or due to a divorce of the children's parents.  Since Luisa and Mark only see and spend time with their grandchildren during holidays, they can be considered remote grandparents. 

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