I have low blood pressure. 100/55 to 90/50 unless anxious! My dad has to have surgery for aortic aneurysm. Does this mean I will get one cause low BP?

Low BP. The low BP actually makes the probability of an aneurysm less. The lower BP causes less wall stress in the blood vessels and less wall damage. Some aneurysms do have a genetic component and there isn't enough information here to say whether that is involved in your situation.