1. The Johnsons have a lot of land.
2. The Johnson family have a lot of land.
3. The Johnson clan have a lot of land.
4. The Johnson family has a lot of land.
5. The Johnson clan has a lot of land.
[Does #1 mean #2 or #3? Or does #1 mean #4 or #5]
Sentences 2 and 3 are incorrect; be sure to use 4 and 5 instead.
Sentence 1 means the same as 4 and 5.