Your little brother is annoying now. Give it ten years. Some of the best friendships take that long to start.
STILLNESS
STILLNESS
People you are stuck with at close range are hard to see clearly, because everything about them is turned up by proximity. A few years apart and some growing up removes most of what was irritating and leaves someone who shares your whole history, which is rarer than it sounds. The relationship you are tired of now is not the finished one.
You do not have to like them any better this week. Just avoid damage you will have to undo later. Say the cruel thing one time less, and keep one small thing you both still do together.
Which family member might become a close friend later?
Free, with nothing to buy inside it.