grammar - How to say "My wife and I did something, then our friends and we [wife and I] did something else" correctly?

Which is best?

"My wife and I just got back from the beach. Before that, her sister and we visited Grandma".

vs.

"My wife and I just got back from the beach. Before that, her sister, she, and I visited Grandma".

vs.

"My wife and I just got back from the beach. Before that, her sister, my wife, and I visited Grandma".