In "Lè yo w vini kay?" does "yo" mean "are?" I've never seen in used that way before. Is there another way to say it?

No, I can't think of any circumstances where "yo" would translate "are".

Perhaps this sentence is not complete.

Maybe they meant:

Lè yo va vini lakay yo.

When they will come home.

Lè yo vini lakay yo.

When they come home.

Lè yo rive lakay yo.

When they arrive home.

Lè yo rantre lakay yo.

When they get home.

Check the following link about "Going Home"

http://sweetcoconuts.blogspot.com/2010/10/exercise-35-going-home.html

Ask me anything