You slightly misunderstand. I am frustrated by the younger sister quitting in a scripted event, but what bugs me is that there is a two choice conversation when it happens, after I've hired her, support her leaving or she accuses MC of hypocrisy, and I'm suggesting that this second choice is somewhat irrational, since the problem isn't that she's becoming a stripper, but that she's leaving the job working for her brother. This happens every time, I presume this is something you intended for later in the game, and the verbiage is simply inserted because leave the job is leaving the job. That is where I suggested perhaps a third option, so she can get upset for some other reason, perhaps preventing her from reaching her full potential.
Hiring her was easy, every time I've played 1.09 or 1.10 I've been able to hire the younger sister almost immediately after she showed, by considering for job. The older sister, OTOH, almost always gets nabbed by another club before I get a chance.
MC age 26, pretty sure the 18 year old cannot be a daughter. I've made that age choice each time, each game the younger sister inconsistently refers to MC as daddy.
I will continue to try to get the mother and both sisters employed in the club, but yes, it was a surprise when I considered the mother for a job and she said she was mainly interested in the sex worker position.
I'll also note, while I have your attention, that I often get women who have lewdness as low as -73 who say they will only consider stripper jobs, and to this point it appears that slaves will happily turn down any job offered, perhaps a third of the time, and will also say they will only accept a job they are wildly unqualified for. May be intended as the characters trying to rules lawyer their way out of consequences, but doesn't seem to fit the concept of must accept any reasonable job offer. I've not yet tried to quantify whether it is worth it, compared to my usual procedure of hiring, training and convincing an employee that they love that type of job and everything entailed, based on how often each type leaves.