Like a job that get people’s movie tickets, it looks fun, it feel like handing a adult a candy, they seems excited lol

Check the references for EVERY adult.  

I have witnessed cases where parents ultimately destroyed their adult kids' life by letting them be irresponsible and living obligation-free in the house.

How schools provide such adult education differs, but they all provide something along these lines.

Just tell her for liability reasons you need all adults on the lease and need to screen her sister the same as any other adult.

Please familiarize yourself with the facts before you start lecturing.From the TSA's website:"Effective June 21, 2008, adult passengers (18 and over) are required to show a U.S. federal or state-issued photo ID that contains the following: name, date of birth, gender, expiration date and a tamper-resistant feature in order to be allowed to go through the checkpoint and onto their flight.

Get rid of welfare for adults without kids, and add social penalties for having kids without the ability to support them.

Discuss your dreams and goals together and come to a compromise, be adults about it.

Am I reading this right that the daughter is an adult? 

You want to be treated like an adult?