Thats terrible, your dad aswell??? i wouldnt go kicking their faces in tho, well maybe give your bro a slap as that is what brothers are like! but your dad, thats just disgusting that he would even find a 16 yr old attractive!! im sure your girlfriend is attractive btw what i mean is, if your 16 he has got to be in his 30's thats verging perverted!!!
sorry that you have to put up with this, personally id isolate myself from them, after letting them know how disgusting they are!! then let them come to you with a huge apology!!
xx