My boyfriend wants me to meet his son. I'm nervous yet excited, any advice?

So my boyfriend's son is coming to visit for a few weeks. I never met him, but I'm confident he's a cool dude just like his dad. So, he just asked me to join them on vacation for Father's Day and booked the flight so now I'm even more nervous than before. Any and all advice is greatly appreciated. Also, me and the dad are 14 years apart and the son and I are also 14 years apart (just in case that matters). I'm awkward and not completely sure how to interact with him. I want him to feel comfortable and know that he will always be his father's number one priority. This trip is for them and it is a privilege to be invited. I want us all to have a wonderful, memorable time.