This game is literal trash. It doesn't matter if from a developing perspective or content-wise. And let me tell you, it gets very dark in the end. Hopefully Dev gets to hear some handcuffs at this point. Honestly! But my own opinion aside.
As for the tapes themselves, here is a little guide on how to find them all.
1: Starting in your room, pick up the tape from the left side of your desk. This gets you an empty VHS. (Will be Important later on).
2: Go into Dad's office. Opposite room of your own. Look at his desk and search the post-it; it will give you the safe code. Open the save and pickup another VHS.
3: Go downstairs and right, then use the first door on the right to reach the garage. On the left side wall behind a shelf is a little orange container holding another tape.
4: Leave the garage and move right around the corner to the right to get the master bedroom key from a cupboard in front of you. Then move back upstairs and enter the master bedroom. The bedside table on the right side, holding another tape.
5: Go downstairs again and also right yet again, then move straight to reach the kitchen to your left. In a bottom-floor cupboard, another tape can be found.
6: Turn around in the kitchen and go right to reach the living room; you will find your sister sitting on the couch. You can search her phone on the table in front of her. After that, speak to her and ask her to go to your room. She wants something valuable from you before she does it. Here the empty VHS comes into effect. Give it to her, and then give it to her again in a different meaning. Some animation will play, and the empty VHS will be replaced by another tape.
I highly suggest you all skip out on the switch-out tape because this turns the whole game on another level of dark. You've been warned!
And that's all the tapes. Hope it helps.