I'm planning on spending a weekend with my three sisters
Why are you planning on spending a weekend with them?
Once a year, for Christmas, our father gifts us with a weekend of freedom.
It's good to want to get away for a weekend and spend it with family. What types of activities do you plan on doing for your weekend of freedom?
I am going to film myself fucking each of them.
I'm not sure what your saying, but it sounds offensive and vulgar and if you want to avoid offending people you shouldn't use language like that.  Don't be disrespectful towards your family or anyone for that matter, it makes you look bad.