Hamsters scared

Yesterday afternoon I came home to a surprisingly sight - all 4 hamsters' cage and tanks placed in the living room:

Moved from their original places, for some reason:

So I asked my mom why were the hamsters in the living room and she answered,

Because this morning outside doing something, then very noisy. Brother was worried the hamsters will be scared, so he moved them here (out of the balcony and into the living room).

My brother is better than me!