Husband laughing at sad situation

My husband has been taking his brother's death the hardest. Idk who all have seen my post but they were about my husband getting a letter from his brother from a mental hospital saying he is a pedophile and attracted to children and he's disgusted with himself so he's locked himself away so he won't hurt anyone. He was planning on getting chemically castrated if therapy didn't work. He sadly ended up just hanging himself. The rest of his family has no idea about the letter and my husband burnt it in a fire place. Last night we were watching a movie and he started laughing. I said what was funny and he said "My brothers a pedo, now he's dead. My life is terrible!" And he's just laughing.... I honestly don't know what to do in that situation. He then takes the whole bottle of wine and goes outside and is laughing so hard. Is this manic?

Edit: I want to add in case there's confusion from the letter his brother never touched any kids. He wanted to which is why he went to get help, and since he never touched anyone and wanted to fix himself that's why my husband burnt the letter.