(DD1/DS) I'm going to download or live steam series upon series of tv programmes then complain loudly at them that the Internet is too slow because I've used up the 500Gb monthly download limit.
(DD1) I'm going to talk at her about my favourite tv actors / singers / famous people and insist that everything I've read on the intent is true - then sulk when she points out that gossip is just that, and unusually complete bullshit.
(DS) I'll liberate every single pair of nail clippers in the house and deny all knowledge of going into his ensuite to get them.
(All of them) I'm going to use their hairdressing scissors for plastic and to open packets in the kitchen because I've lost their kitchen scissors.
(DD2) I'm going to ask her 10mins before she need to leave the house to straighten my hair, then sulk when she tells me I should have asked earlier.
(DD1) I'm going to say "in a minute" when she tells me to have a shower, and keep saying that for at least 10 hours, then get in the shower after 10pm and complain that my hair is poufy in the morning (because I went to bed with wet hair!) and somehow make it her fault.
(DD2) I'm going to constantly complain that the reason I can't bring my friends over is because she's embarrassing.
(DS/DD1) I'm going to spend the entire day in my room, only coming out for meals, then head straight back into my room and when they say "oh you're still alive then" I'll roll my eyes and mutter about them, only it'll be loud enough for them to hear.
(DD1) I'm going to get an extensive collection of bonsai trees then leave it up to her to take care of them, even though she never wanted them in the first place.
(All of them) I'm going to claim every single good idea they ever had as my own!
(All of them) I'm going to ignore the family calendar and the fact that they've been out every day for a month taking other people places and on the one day they can have a lie in, agree to go out with some friends leaving at some ridiculous hour of the morning.
(DD1) Finally, I'm going to proudly proclaim that I stayed in bed till gone midday but I'm still tired, while looking at the huge bags under her eyes and ask "what's for lunch, I'm starving!" Then refuse to eat it and get all passive aggressive about the fact no one ever buys food I like, not caring that I change my mind on an almost daily basis about what food I'll eat.
Hopefully I won't have long to wait to enact my revenge as they are between 15 and 20 years of age.