5-SECOND RADICAL BREAKDOWN
兄 (Older Brother) vs 弟 (Younger Brother) vs 子 (Child) vs 説 (Explain)
兄 (Older Brother) is a big mouth (口) on legs (儿), and adding Speech (言) to Older Brother gives 説 (Explain)!
兄 (Older Brother) is a big mouth (口) on legs (儿), and adding Speech (言) to Older Brother gives 説 (Explain)!