Opening Doors to Your Dream Home, The Carswell Family moved to the Magnolia/Tomball area in 1963, back when Spring Creek Bridge was a wooden bridge structure. Lisa started her real estate career in 1996 and founded Carswell Real Estate Co. Inc. in 2006 with the help of sons Justin and Brandan Carswell as broker and agent. Our reputation is based on service, safety, and quality, regardless of how large or small the job.