Secondly, because many parents are eccentric and small, they hope to share more love with their younger children when they appear. This is an uncontrollable amount, because they will think that their younger brother needs more care, but you are older than your younger brother, so you can take care of yourself and sometimes help them take care of their younger brother together.
Finally, it is because your parents think that you should love and care about your brother as much as they do, because your brother is the youngest in your family, but in fact you are just a child, but your parents have unconsciously favored you two.