Let me answer that one with another question - how long is a piece of string? 🙂 Sometimes we hit insurmountable brick walls in our family tree research just a few generations back. Records were destroyed in wars, families were dislocated by world events, the ravages of time deteriorated records to the point they are illegible, or just don't exist. Other times, we strike gold and an ancestor links into a well-documented family with a recorded genealogy that stretches back for centuries. The only way to find out what kind of branches your own tree holds is to methodically work up each generation, ensuring you have the documentary evidence to support each next step until that branch reaches an end. Even then, the end may be temporary stop, as occasionally new record sources come to light, and a brickwall can be smashed through.