Disease are irritated to human being and it's the most nightmare human has ever had, hypertension is a serious disease and is really a low key disease too which can ruin human immune system without noticing. I feel sad for your sister -inlaw who was diagnosed with hypertension and as the results ended in the grave, I wish we could eliminate hypertension, not just hypertension but all the diseases from the world, the world will happy indeed. Best of luck.