The summary is:
The speaker is a man who has a sister and no brother. He talks about his experiences and opinions on sibling relationships, especially between brothers. He watches some videos of siblings doing funny or annoying things to each other, and comments on them with his friend. He also mentions some research findings about siblings and how they affect each other's personalities and skills. He ends the video by wishing everyone a happy world brotherhood day and thanking his viewers.
Here are the key facts extracted from the text:
1. The speaker does not have a brother.
2. They have only one sister who is 4 years younger.
3. The speaker's cousin also wanted a sibling.
4. The speaker and their cousin get along very well.
5. The speaker has a relationship with a transplant.
6. They are reacting to videos popular on social media.
7. The speaker's mother's name is Belina.
8. The speaker is currently in Bursa.
9. They suggest showing something that is a shame.
10. The speaker expresses love for all.
Please note that some parts of the text were unclear or incomplete, so I've extracted the facts from the coherent sections provided. If you need more details or clarification on specific parts, feel free to ask!