The summary is:
The text is a transcript of a video where a family is trying to solve the mystery of who is sending them messages and challenges. They receive a message from someone who claims to know them very well and gives them a clue about their name. They go to a beach where they find a box with another message and a hint about the person's location. They are confused and scared and wonder if the person is watching them or if they know someone from the video. They try to contact the person but get no reply. They decide to wait until 2020 for more instructions.
Here are the key facts extracted from the text:
1. The events described in the text occur on a Sunday.
2. The narrator and their companions are on their way to a place called "Reserve Beach" in Rio de Janeiro.
3. They are following a set of instructions or clues that they believe will lead them to a mysterious person or location.
4. The narrator mentions that they have been receiving messages from an unknown person who claims to know them well.
5. The messages are cryptic and seem to be leading them on a treasure hunt of sorts.
6. The narrator and their companions arrive at the Reserve Beach and begin to follow the clues, which lead them to a specific location on the beach.
7. They find a stone with a message written on it, which appears to be a clue.
8. The narrator mentions that the mysterious person has been sending them messages and seems to be watching them.
9. They try to communicate with the mysterious person through messages, but the responses are cryptic and unclear.
10. The narrator and their companions are determined to solve the mystery and uncover the identity of the mysterious person.
11. The events described in the text are being recorded and will be shared with others.
12. The narrator mentions that the mysterious person has been sending them messages since the previous day.
13. The narrator and their companions are trying to figure out the meaning behind the clues and the identity of the mysterious person.
14. The narrator mentions that the mysterious person seems to be someone who knows them well, but they are not sure who it is.
15. The events described in the text are part of a larger investigation or mystery that the narrator and their companions are trying to solve.