Is the 44-year-old aunt's fitness method good?

If they are brothers and sisters, then a 44-year-old man should call a 56-year-old woman his sister.

In our north, a 44-year-old man can be called a 56-year-old woman elder sister, not an aunt.

So what do people call each other? There should be a local name according to the age difference.

Only by combining these can we better adapt to life. This is the so-called do as the Romans do.