Uncle Misha:
https://f95zone.to/threads/girl-life-v0-7-4-1-ecv.411/page-154#post-1817122
Stepfather:
IMHO not worth it, but there are a few ways:
1) Take showers on weekends when Stepfather is in the Living Room. He will peek sometimes. After enough times peeking he might enter and fuck you in the shower.
2) Meet Uncle Misha (see link above) and then go to Stepfather's garage when Stepfather & Misha are there. Misha will tell your Stepfather what a whore you are (might have to have been spotted with cum on your face walking around town) and the pair of them will "punish you" with their cocks.
3) When your Stepfather is around the house (either in living room or at breakfast) take off your panties and then go talk to him. Ask him what he thinks of your outfit. Sometimes he will just ignore you even if your relationship with him is 100, but sometimes he will spread your ass and stick a finger in your holes. Also, if you chat with him while not wearing panties you might get the option to tease him, etc. One of those options has a chance of him dragging you to the floor and making you suck his cock, or dragging you into your parents' bedroom and fucking the shit out of you. I haven't looked at the code, and I haven't found a reliable way to trigger that event, but it happens sometimes.
IMHO: Why I don't think it's worth it - 1 & 3 are so random and such low chance that they might not happen in an in-game year if you try every available chance. Meanwhile #2 is reliable yet repetitive to the point of boredom.