Sasha is sister, so you can meet her at home (you can also reveal Girl Locations on the left side).
Steph on the hand is unlocked much later, when you graduate from university, if you accept job at High School.
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As far as money goes, I always use this for these kind of games:
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You first make a "save to disk", then load it onto the site, you search value needed (Money is quite easy, since it's value can be rather specific, like... 325), so you look at the money you have, press Ctrl+F, type the value in search bar, and change it.
I've also used this to increase exams passed, I've cleared first threshold (5) properly, but when it needed 10, I've decided to edit passed value to 9, and just needed one more test. (It's usually the best to just edit below triggering value, in order not to screw up scenes)
