Translation of negligent in Spanish

As I have already mentioned in my last email, it is a breakthrough, I have never been so successful. I have visited several Spanish schools and would like to discuss that by telephone with you.
It certainly is one of the reasons that a student from abroad is not as good in English as people who were born in America. This is an obstacle for all students and a challenge for the educational system.
My daughter and her husband have invited me today, it is always very nice to visit them. There were many friends there too, because it was my grandson's birthday. We were very happy and celebrating.