Sexual Abuse? From Family Member?

I dont know if this is the right place for this. But it was a family member who did this to me so I guess it fits? Thankyou so much in advance for your opinions on this situation :)

Well...whenI was about 12 I met my grandfather (he left my mother when she was 2 and we finally found him.) He lived in Perth, so he flew over to where I live to stay for a month. I was really participating in my sport at the time, and he was a little athletics coach. He always took a liking to me, and preferred me to my sister. On facebook he would always stalk me, and message me whenever I went online and that sort of thing. It was creepy. He made a few remarks on how he wished his wife had "my body". I was 12. He was basicallysexualising a 12 year olds body. My parents found that creepy but they don't really think anything else happened. As he was a little athletics coach I thought it would be okay if he sort of massaged me. Apart from the fact he only ever touched my private regions and focused on them. Sometimes he would force me into a massage, that I didn't really want. Does this sound like molestation or am I just overreacting?