A few questions

Hi, I'm wondering if there's anyway my family could be accessing files/internet history from my laptop on theirs? We're all connected to the same wireless internet connected throughout the house which I believe is also connected to my fathers workplace connection somehow. (Hope this is making sense haha) Plus there's a TS Gateway connection my father setup on my computer which I believe was to access work files. But I'm wondering if there's anyway my files could also be accessed as I'm highly suspicious that has been done. There's nothing I'd be too worried about but it's more just the invasion of privacy. Also wondering if it's possible for them to access my internet viewing and site history if connected to their wireless connection?

I hope this wasn't too confusing sorry haha and thanks in advance to anyone who can help me. :)