I’m quite shocked at the disgusting attitudes towards autism, and the ignorance around how it can present. I’m quite shocked at the attitudes towards the other innocent child, and the suggestion that she should just accept being abused because…. Autism.
There is a difference between understanding and acceptance, and while one might have understanding of certain behaviours that does not necessarily mean they need to be accepted or that they are acceptable.
Whether people want to admit it or not this 13 year old is going to grow into an adult and is going to have to cope in the outside world one day. And lashing out and becoming violent and abusive isn’t going to be tolerated by the general masses.
Something needs to be put in place in order that this behaviour can be addressed.
The OP isn’t going to be around forever, and the daughter isn’t likely going to want to have to take responsibility for her abuser simply because he has autism.
Unless a child’s difficulties are so severe that they will never be capable of living an independent life, and following the parents’ passing will have to move to a residential facility, it is the parent’s job to ensure that that child is equipped to live as part of a mainstream society one day. And that includes having to address issues such as violence.
In 20 years time the wife of this now child could be writing on here about how her husband is lashing out at the kids, or at her, and I guarantee you no-one will be saying “he’s autistic, people just don’t get it,” they’ll be saying “he’s abusive, you need to run for the hills and keep your children safe by getting them away from this horrible abusive man.”
But if the problem is addressed now it shouldn’t come to that.
Children don’t stay children forever. They are the adults of the future.