Brothers helping brothers. Likewise, sisters helping sisters, and siblings in general helping each other. It happens across geographies, time and culture.
Here is my dad and his younger brother, Ellisuncle, getting ready for the wedding of my cousin Aruna. And one hotel room over is my son Paul, with the same intense focus helping his younger brother, Sidd, with his zipper tie. (Yes, a zipper tie. Hard to know what sort of help is needed.)
Age-wise, ~60 years separates these two pairs. Yet a blessed pattern repeats itself.