How do I deal with my boyfriends dad constantly glancing at my boobs?

I have noticed my boyfriends dad several times looking at my boobs/ cleavage. I don't want to sound conceited but I do have pretty big boobs and I don't necessarily try to show my cleavage off but with the size they are sometimes it just shows. About a month and a half ago I had a little incident in the pool in front of his dad. We were all at their house having a cookout there were several kids there that I was playing with in the pool. I picked up one of the little boys above my head in the shallow end and the other little boy that was in the pool reached up at me to pick him up and when he did he grabbed a hold of my tube top bikini and pulled it down all the way to my stomach and I could not quickly coverup because I did not want to drop the boy. I tried to use the little boy I was holding to block the view of my boobs until I could set him on the edge of the pool because he could not swim. My boyfriends dad and neighbor saw the whole thing and I know they saw my boobs.

My boyfriend and the rest of his family were inside I told my boyfriend what happened and he just thought it was funny. Ever since that day I've noticed several times my boyfriends dad looking at my boobs and it's starting to get a little weird. I've not said anything to my boyfriend about it because it's pretty awkward for one and I'm not sure how my boyfriend would take it.

What should I do in this situation? It doesn't matter if I'm wearing a shirt that shows cleavage or just one that's fitted to my body he still looks. I don't necessarily want to start wearing big baggy T-shirts like a hobo but I don't know what else to do.
How do I deal with my boyfriends dad constantly glancing at my boobs?
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