Hello and welcome to the forum. Thanks for your question. Being overweight is a risk factor for having high blood pressure but anyone can have hypertension. https://www.mayoclinic.org/diseases-conditions/high-blood-pressure/symptoms-causes/syc-20373410 For most people, they have primary hypertension meaning there is no known cause.
No. High blood pressure can be a part of your family back ground.
Yes you can still have high blood pressure. It can come from you family history.