1. This function comes with Xiaomi's mobile phone, so you don't need to download extra software. It's in the system tool.

2. I found the calculator function. I didn't expect the calculator to work out this.

3. Click the menu above to switch the calculation mode.

4. Slide the phone left and right to select the relative address calculation mode.

5. The basic personal relationship titles are all here. Start with me, and then calculate the relationship title with the other party.

6. Click on the relationship one by one to get the final address, or click on mutual check to see how to address each other.