My surname is Li, and my ancestors moved from Nanfeng, Jiangxi to Changshan, Zhejiang. Now there is an inscription of "Longmen Family" in my old house for more than 200 years. What does this mean?

There is too little information to prove, so let's guess.

Longmen family, as its name implies, is the family of Longmen-a big family.

There is an ancient town of Longmen in Zhejiang, which is only 50 kilometers away from Hangzhou. It is said to be the hometown of Sun Quan in the Three Kingdoms. It is estimated that your ancestors were a big family here more than 200 years ago, so they are called Longmen family.

You can photograph and paste the inscription of "Longmen Family". Or genealogy, small characters in inscriptions may provide valuable information. So as to make a judgment.