Think that sometimes your sister can be The Worst? Then you’ll be miffed to read that this sister may well have stolen the title…

Some people are close to their sisters.

Others have a little more trouble.

And some sisters are so different that it’s surprising that they came from the same bakery.

Like these two women from the US – who are having so much trouble that one of the sisters she asked Chicago Tribune columnist and NPR regular Amy Dickinson what she should do.

Here’s what happened:

One sister (who calls herself Sad Sister), organises a shopping trip and girls getaway every Autumn. The women go shopping, treat themselves to a fancy hotel and eat out a lot.

But Sad Sister doesn’t invite her sister, “Wendy”, to come along. And now sister Wendy is reallly hurt.

The reasons that Sad Sister doesn’t invite Wendy are breath-taking in their pettiness.

And Ask Amy didn’t hold back in one of the best advice column take downs you’ll ever read.

In case you can’t read it above, the full letter (that was published online) said:

And the reply:

Ask Amy makes an excellent point: If you can’t see that your divorced, sick and financially-strapped sister is in desperate need of a weekend away, or just a decent friend, then you are indeed a horrible person and a truly terrible sister.