There's no excuse for him not attending. He hasn't contributed even a penny towards her final expenses or the memorial.
I don't know how to feel about this. I want to be angry at him for not loving our mom, but I think my mom would rather have me pray for him because this is pretty indicative of his heart's condition and I know this was a source of anxiety for her. She knows I'm okay and we'll see each other again. But him... not so much. Deep inside, I think she knew his heart was hard.