Gabrielle,
Good of you in doing this for your parents as so many older people are left to sort things by themselves. First of all I would look at where your parents might be having any problems at the moment. Have they joint problems, eg, hips, knees, etc? Do they have blood pressure issues, heart problems or similar? Have they breathing or lung issues, kidney, liver or similar, or any genetic disorders their parents or siblings suffered from? As you go through the different ailments they might be suffering from (or maybe they've been lucky and don't have any) tick off the ones that they don't have any problems with as more than likely they won't crop up now and, suit your policy to the sickness's they might have issues with and see where that gets you. There's a cardiac centre of excellence in the GUH (Galway university hospital) with great service and treatments in all places in Galway, along with the Galway clinic too.