Autism

Hi ladies! So my boyfriend has been great to me, our parents have met and everyone likes each other. I haven’t met his younger sister, only seen her like twice but I want to get to know her or at least have a decent understanding/bond of each other. She has Aspergers (mild autism) and I was wondering what I could do to accommodate for that and communicate better with her? She’s a very sweet girl I just want to at least have some sort of relationship with her, thanks!