does this occur with your siblings

Tabitha
My sister (younger like 14 months) has a bf that she sees everyday like 24/7 and in person on skype and does things in front of me like make out and my bf he's like don't want to hang out 24/7 or even skype for a few hours and it's made me jelly and I secretly have a crush on him but he's way to old for me he's 33 and she's 16 but my bf is 20 and im almost 18 what I'm trying to say do you have siblings who brings their bf over and constantly make out in front of you to get you jelly??