"They have a rental for years"

They, who? Is that now being titled to the LLC?

This is why they need a new attorney.

"Then they got a lease on some land"

Who owns that land? Here we go again, with the pesky legal ownership details, which matter.

"and had a LLC formed."

But an entity such as that LLC cannot make money or incur costs on something it doesn't own, unless it is leasing or renting from the owner, and then subletting. This can get very ugly very quickly.

"I know that a married couple in Wis can be regarded as a sole proprietorship."

But you have a multi-member entity, now. If they are going through with all the necessary changes, of course.

"Was just wondering if there had been any changes in the law as to having more than husband and wife."

Did you look at the google results I mentioned?