It's becoming more apparent how much dd (4yo) is being influenced by ds (6yo, asd). Inevitable that she'll copy him I suppose, I'm sure that's normal in sibling relationships. But of course the problem is that she is copying his inappropriate behaviour and I'm getting worried that it's now affecting her relationship with other children.
Eg at nursery yesterday when I picked her up, a little girl came up and said to her "dd I like your top" and dd's response was literally to shout at her "stop saying that to me". Poor little girl was understandably confused and probably a bit scared. It's made me realise how much shouting goes on in our house (obviously we try everything to deal with this, etc etc etc, but....) and how she probably thinks it's a normal way to interact with people 
Or she starts talking to other 3/4yos about Doctor Who as of course ds has been watching it and she has to watch too so as to join in with him (she really does know far more about Dr Who than is healthy!).
Or another eg when ds does his usual thing of not responding first/second/third time when she calls his name, and she shouts to get his attention, is she going to think this is the norm?
So on top of all the usual stress/worry/exhaustion of trying to shape ds's behaviour as much as we can, I don't know what I can do to ensure that dd 't a) doesn't think this kind behaviour is the norm, b) knows how to engage with other children without resorting to the kind of behaviour that she has to with ds, and c) what kind of impact is this going to have on her own personality, identity, self-esteem, anxiety etc.
I've been talking to nursery about it all, and they say she's just still learning how to join in with others, but the point is that if her main role model is ds, how can I prevent her from learning in a way which is, erm, off-kilter?
I try and get as many playdates as possible for her, and try everything to teach ds appropriate/inappropriate behaviour etc, use reward incentives with them both (tick charts etc), but of course ds has asd and his behaviour and interaction will always be different.
not sure what the point of this post is, but just wanted to know any strategies others might use, or are there any resources/groups/courses/books I could use to get ideas?
Sorry so long.