What would you do?

I have a situation. I’m getting married in October and my family and my fiancé’s family are two different people. My family are preachers, his family cusses, drinks, smokes pot, etc. you get the idea. Well, they don’t like each other. Okay, who cares that they don’t like each other they can suck it up for a day. My problem is, we want to have alcohol. My family will talk down on me months after my wedding if I do this around them. So I came to the conclusion I could just get them to leave at 8 and do what I wanna do afterwards. I can’t be myself around my family and I wanna have fun at my own wedding you know? So how do I do this? They’re trying to pay for the receptionist and I just feel bad. Idk. I just need some advice on how to handle this! TIA!