It's understandable that you feel shocked and confused by your brother's behavior. Without more context or information about your family dynamics, it's challenging to pinpoint the exact reason for his actions. However, I can offer some possible explanations:
Playful gesture: It's possible that your brother did it playfully or as a joke, without intending any deeper meaning behind the action.
Cultural or religious influence: In some cultures or religious traditions, showing respect or submission through acts like touching an elder's feet may be considered a sign of reverence.
Mimicking behavior: Children often mimic actions they observe from others, and he might have seen this gesture somewhere and decided to imitate it without understanding the implications.
Seeking attention: If he noticed it was shocking or surprising to you, he might have done it for attention or to get a reaction from you.
Regardless of the reason, if this action made you uncomfortable or you are unsure about its intentions, it's essential to address the situation in a sensitive and understanding manner. You don't necessarily have to ask him directly about it if you don't feel comfortable doing so. However, you might consider talking to a parent or guardian about the incident, who can offer insight into your brother's behavior or intervene if needed. Additionally, keeping open lines of communication with your brother can help establish a healthy understanding of each other's boundaries and emotions.