Autism and forgiveness?

Hi there everyone, I have an older brother who is Autistic and from what he tells me and the rest of our family has a lot of trouble forgiving others because of his Autism. I believe he means it's because from what I understand people with autism tent to obsess over things and or is hard for them to get certain things out of their mind. But I'm not entirely sure, it can sometimes be a little bit difficult to communicate smoothly with him. I was just wondering if this is common with other people who have autism and if anyone has any good suggestions that may be helpful on how for an autistic person to forgive others. Thank you so much!

Autism and forgiveness?
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