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It depends how long they had been in Spain, but they could get Spanish citizenship (idk about Spain, but I checked Portugal rules on Madeira, for both EU and Non-EU citizens). However, if they are just moving back and forth with the seasons, then they should check how the UK system compensates them for health expenses in Spain.
My neighbor has been living there permanently, they used to have free medical treatment when UK was still in the EU..They have registered as locals with residents now, so when they need special hospital treatment they go to England because they also have property there, so they can still avail of the health system .