What should I do?

So I go to my boyfriends parents house all the time and I have notice lately that his father has gotten really touchy with me. Before his father would only side hug me, but now his hugs linger and his hands are always on my lower back. He has never hugged me like that before until a few weeks ago. Today we went over his parents house to visit family and when his dad hugged me he kissed me in the neck! I was very uncomfortable and for the rest of the night I didn’t look at him or say anything to him. I want to tell my boyfriend because this has made me feel really uncomfortable. I just don’t want my boyfriend to do anything crazy towards his dad and I don’t want to cause drama. Please give me advise and tell me what you would do.