How can I get my sister to stop dwelling in the past or bring up negative thoughts?

Anonymous

My sister is on the autism spectrum and is very smart. She’s polite, friendly and can have a pleasant conversation, but I gotta be blunt, she sucks at social cues. I mean she’s gotten better at it, but when she was a lot younger, she was horrible at it no offense to her. She loves positive moments, but sometimes she always brings up negative stuff and that’s all she wants to talk about sometimes and we have to keep reminding her that we don’t wanna hear about it. Like one time we found out our mom has cancer, I mean yes it was a horrible thing but our mom has a positive attitude. Of course her positive attitude doesn’t change the fact that she has cancer. She’s been depressed about it and I can understand that but our mom said that she shouldn’t have that mindset and she needs to have a positive thought I’m talking about negative stuff doesn’t help and she’s right. We got to visit her a couple times, and we always brought positive memories. my sister said that we’re glad we got to see her but she wishes it was at a different time and if it wasn’t for a sad moment but we cut her off and said, “Nope. We’re not talking about that. We’re only gonna have positive attitude stop bringing up negativity. She said, “I know they and I don’t wanna talk about it either but I’m just saying-“ then our brother cut her off and said, “Yeah but you’re the one that keeps bringing it up. Don’t be a Grinch.” She shut down, but I told her to not sulk and besides she’s the one that brought it up. She always brings up the past about the negativities, but we have to keep reminding her that we don’t want to hear about it and if she keeps talking about it, we’re not gonna listen to her anymore. We shouldn’t have to tell her because she’s an adult and we’re not gonna treat her like a child. She’s not five years old so we’re not going to sugarcoat it. She’s 21 and will be 22 in March.

How can I get my sister to stop dwelling in the past or bring up negative thoughts?
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