Is this sentence grammatically correct Fred loves to tease Ethel and Lucy Desi?

The sentence is grammatically correct, but it's a bit awkward and potentially confusing.

Here's why:

* Ambiguity: The sentence could be interpreted in two ways:

* Fred loves to tease Ethel, Lucy, and Desi.

* Fred loves to tease Ethel, and Lucy Desi (as a couple).

* Better clarity: It's clearer to separate the names with a conjunction:

* Fred loves to tease Ethel, Lucy, and Desi.

* Fred loves to tease Ethel, and Lucy and Desi. (if it's specifically a couple).

* Consider context: If this is referring to a specific situation, you might want to provide more context. For example:

* Fred loves to tease Ethel, Lucy, and Desi when they're together.

* Fred loves to tease Ethel, but Lucy and Desi always defend her.

Choose the version that best fits the meaning you want to convey!