Put your foot down, let them know who's boss.

“Lisa told me to make sure you guys finish the homework as soon as possible,” I tried to gain some semblance of authority, as always, it didn’t come out as forcefully as I wanted it to “Believe it or not, I’m going to listen to your mother instead.”

“She got you whipped, huh?” Cameron commented on the pecking order, I was certainly not fond of what the girls might do to me if I wasn’t careful, but I was definitely afraid of what Lisa might do if I didn’t do as she said.

“Nobody has me ‘whipped’, Cameron,” That wasn’t true, I had certainly been incapable of refusing Lisa’s orders for a long, long time “Now enough arguments out of you, unless you too want to be on the receiving end of Lisa’s wrath.”

• Amanda and co. actually agree, but...
• They, predictably, rebel against you.