AITA for canceling my sister and her husbands trip because they refused to pay me for my time

I (32M) own and manage a construction business. I get paid per hour, same as my workers. <br><br>My sister (38F) and her husband (39M) asked to come over my house and I had to clear my schedule for two days and pay both my second in command and my foreman full pay to cover their trip. <br><br>They asked me to help them with some renovations to their house and it was going well. <br><br>When it came time to pay for the workers that cleared my schedule, they insisted I didn't need to be paid for the trip. <br><br>They said it wasn't right that I was profiting off their personal lives and that I should be grateful to help them.<br><br>I told them I either get paid or I can't help them and I'm not a personal worker. <br><br>They didn't take it well and said I was greedy and only cared about the money. <br><br>I told them fine then they could come back and pay me what I was owed from watching their kids. <br><br>Now they are canceling their trip and saying they will watch the kids for free. <br><br>I don't think it is right that I have to host them and watch the kids for free and I do think they owe me money. <br><br>AITA for not letting it go?