What do the Winkle brothers mean?

Wencker's elder brother means that his younger brother is kind-hearted, hardworking and enterprising, and willing to help his younger sister solve problems and take care of trivial matters.

Snail brother's terrier comes from an online joke. The main content is that my sister is very helpless when she spits out her boyfriend: I can't find a snail-like boyfriend anymore! He's all right. After he came to my house, I didn't have to take care of anything and change the water. You can drink water once every two or three days, and you have to change it once a day when you come to him. He also bought a water dispenser and a filter online behind my back, so there is no need for bottled water at home. ...

Generally speaking, the snail's brother describes her boyfriend as a snail who can do everything and do it well.