Make sure my spanish translation is correct?

I want to say to my friend in spanish:



"Has your nephew left yet? Im thinking about coming to school tonight"



I think this is how you say it:



"Ya se ha ido su sobrino? Creo que voy a venir a escuela esta noche"



Thanks in advance!Make sure my spanish translation is correct?
MARIIANNN is right.



I am thinking about going to the school tonight. - Estoy pensando en ir a la escuela esta noche.



Creo que voy a venir a la escuela esta noche - I think that I am going to come to the school tonight.Make sure my spanish translation is correct?
Ya se ha ido tu sobrino? Estoy pensando en ir a la escuela esta noche