I really don’t know what to say

How do you deal with feeling helpless? You want to say something to someone, but you don’t want to come across insensitive.

This is someone that is very important to me, but we have only just recently come in contact. His mum is very sick and is not long for this world. So, suffice to say that I’m a bit hesitant about what I want to say.

I am really struggling with what would be the right thing to say. I usually have the words in my head, for any given situation, but this has floored me and I really don’t know what to do