The girl usually supports her brother if she knew that he is in love.
The boy usually prevents his sister if he knew that she is in love.
Because she knows the meaning of love, and he knows the intentions of men.
This is like the cutest thing ever. It’s from the gif-set I reblogged.
Taking its first steps, and after successfully doing so, the chick goes “Yay!”
It’s so freaking cute.