As a thought in light of the high BP readings which could indicate stage 2 or even 3 hypertension as well as the existing presence of cardio involvement, perhaps it would be best to skip the home remedies and allow the treating physicians to decide on the best form of treatment. In my humble view, this also includes swerving the "drug X worked for relative A, so let me have a go" school of thought. Not as simple as that as the presence of co-morbidities need to be taken into account as well as in this case an assessment of any possible or likelihood of target organ damage.
Important thing as has already been stated by @cots and recognised by others, is the importance of persuading the patient to seek medical services so they can decide on the best and appropriate form of treatment.
Important thing as has already been stated by @cots and recognised by others, is the importance of persuading the patient to seek medical services so they can decide on the best and appropriate form of treatment.