If strokes run in someones family, can they take meds early to prevent it more effectively?

Update: My mother is 69. Her father had a stroke when he was in his early or mid 70s. Her mother had a stroke in her early 80s. I am worried about her....
And I am not a good candidate to care for a stroke victim, as my career isn't in the medical field whatsoever and don't have the strongest back in all the land :P
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