Sadly Awkward

Since the first term beginned, we already made the database of the children, including : full name, copy of birth certificate, father's name, mother's name, address and children's medical histories, etc. So we put their datas in our student's guide book, then fill their names and datas on children's daily books' front page. The daily book is for communicating between teachers and parents.
I t's been half year I taught the class , one day I had a homework for them. The homework is a cut-paste pictures, so I think some of them needed adult assistances at home for doing that. Then I told to everyone in the class," Children if you guys cannot do it by yourself, you must ask your mother or your father to help you. Bcoz you have to use scissor safely." Everyone nooded that mean agreed with me, but suddenly one boy student raised his hand and told me,"I can't ask my father to help me, because I don't have a father."
I was in silent for 10 sec, no word came out from my mouth. I had to think fast, then I said:,"Oh............then you can ask your grandma, grandma can help you for sure." with my awkward smile.
After the class, I tried to find infos about that student from his grandma. His grandma is always picking him up by walking after the school. I feel so sorry, bcoz I found out that his father was already gone since a year ago. Deepest condolences. I never realized before, we have wrong database. It's because his mom didn't mention any of this situation. Perhaps they need more times to accept that. My fault, that I didn't know that.

Hope never happened again in my life.