My dad is having a legit roof put on tomorrow and my sister feels we are being taken advantage of because the roof is costing so much. I do not know what to do.

Get many quotes like 4 or 5 not just 2 or 3 and when you find the best one make sure they are licensed and insured so you can remedy any problems in the future.

Also its a good idea to get multiple quotes, do research, and ask questions. Much like buying a car.

You can definitely get a cheaper roof, but it's very easy to end up with a crappy roof that can cause major issues in the future. The house we bought had a very new roof on it but it had so many problems that we had to replace it, including leaks and rot. Your dad may be spending a lot on a roof, but he'll be getting a good one from Legit.