Sima was an official position in ancient times, and there is a saying among the people that "Sima Fei Rong is expensive". Some officials who have served as colleagues often sign "Sima Di" in front of the Constitution to show that they have crossed the beam. Usually, someone is an official of Sima, calling his family Emperor Sima. So your ancestors were all officials from official to Sima, and his residence was called Li Sima, not Sima.
If you want to find your own context, look up the official Li of Guangdong official Sima. It is not difficult to look up the local websites of Guangdong or the local chronicles of provinces and cities. Then you can understand their word generation spectrum through the whereabouts of his family, and your context will be clear. Go down this road and wish you a smooth investigation!