Help please(urgent and serious)

opened whatsapp and then meta ai because its chat was already open, i was curious i my mom or brother used it and for what, i realised it was my little brother(i understood his writing style) he is 11 years old and in class 5, he searched "how humans reproduce", "sex reels" and "why do me put their peepers in women"," sex education" and other stuff. I dont think he is the right age for sec education, i didnt tell my mom and just deleted the chat, who do i do, i did talk to him about it and i am confused what to do, i am just 15 myself. Dont give 1 liners, give some proper solution quickly. Please and thank you