I was going to ask how old you are but then I noticed that you also posted something similar where you mentioned that you are 16 years old.
You need to get to the bottom of this and find out what exactly happened. Is there any chance you could discuss this with your parents? Unless you feel that they were the ones abusing you, talking to them would be a good first step. Tell them all you remember about the man, his sons and the hot tub. If you have a good, loving relationship with your parents, then they will also want to get to the bottom of this.