What does estar a la greña mean?
Expression
to be at each other
La greña is tangled hair, and andar a la greña was pulling it. Today it describes two people constantly bickering over small things. The continuous and the minor both matter: a serious row is not estar a la greña, which is why it can be said straight after muy bien.
Mis hermanos están siempre a la greña por el mando.
