Twins or Not Twins??

Whenever Wenz sees Denz bathing, she will want to bath as well.
Whenever we change diaper for Denz, Wenz will want to change hers.
Whenever Denz poos, Wenz also poos making us busy washing them up. I wonder is mere coincidence or what??

Ome more thing is whenever Denz cries for milk, Wenz will ask for milk too. Above picture tells everything isn't it? (",)