I had the urge to eavesdrop on my aunt when on a shared phone line. She thought it was my dad.
Why did you eavesdrop on your aunt's phone call?
I just want to know the details of a family incident.
I see you are very curious, but you shouldn't eavesdrop. Your aunt will be very upset if she finds out you were listening to her private conversation.
It's not a big deal, my plan will be revealed soon and then I will get rid of my dad.
I get that, but you shouldn't be eavesdropping on family conversations. If you're curious just simply approach your aunt and ask her about it.