Prior to getting unlock, try looking at the maid in the morning, in the study. Use the "look at" command.
Yes, at least two. Try reading page 16 (it's the one before this one). Way to show initiative my man.
Very easily: just need to use warp mind 5 times. Easiest rota:
1) Elder Sister running, in woods (morning)
2) Elder Sister, pool, bikini + warp mind (add lust if low on sin - you won't be) (noon)
3) Elder Sister running, no spell, shower, telekinesis soap > warp mind (morning)
4) Younger Sister, her room, romance novel, lust then warp mind (noon)
5) Mother, bath: add oil to bath, no spell, unlock door > warp mind (evening)
Unlock then pops, takes 2 days.
Getting a full set of stage 3 powers (command, mana-up, tele lvl2) only requires 6 quests to be completed (probably only five).
The issue the game has is that Sin is capped @ 15 and if you don't bee-line for the upgrades you'll waste a lot of points.