The summary is:
The speaker is a rap enthusiast who invites three mothers whose sons are rappers to watch and comment on various rap videos. He also plays a prank on them by pretending to rap himself and asks them to guess which rap song is made by their son. He praises their sons' talent and thanks the mothers for their participation. The video ends with a song dedicated to dairy products, the sponsor of the video.
Some possible key facts extracted from the text are:
1. The text is a transcript of a video where three mothers who have children who rap are interviewed by a rap enthusiast.
2. The video shows different clips of rap songs and the mothers give their opinions on the lyrics, the images, the messages and the styles of rap.
3. The video also plays some songs made by the children of the mothers and asks them to guess which one is their son.
4. The video aims to show the diversity, the creativity and the emotion of rap as well as the bond between the mothers and their children through music.