Father in-law caught me sunbathing [I Was Caught Naked By Family]

This past summer I was outside tanning. Since my backyard is fairly private I usually will tan nude since no one can easily see me. My husband's father came by the house to drop off some paper work and let himself in which is usually no big deal. He knew I was home but couldn't find me, so he wandered around inside then eventually came outside were he found me laying on my back. I am not sure how long he was there but I didn't notice him until he let me know he dropped off the papers. When I heard this I reached for my towel to cover up which meant he got a view of my ass as well. I am sure he was there a while and said something on purpose just to see me move and shock me. He didn't say sorry or any thing. Just hey dropped of xyz see ya later!