How Do Ask Someone To Get Out of Your House Nicely? [POLL]

Yesterday I planned a nice Mothers Day Brunch for my mom and I invited my brother and sister to join us. To my surprise things didn't go as planned due to an unexpected guest. To make a long story short I had to ask this guest to leave before he ruined the entire brunch and before my kids started repeating the things he was saying.

I have a tenancy to be rude when I am offended, so I tried to think of the most polite way for me to ask my inappropriate guest to leave. I told him that today was not a good day to hang out and that maybe he should come back when my kids aren't around...meaning in 15 years. Was there a better way to ask him to leave?