What does a son-in-law call himself when he writes an obituary to his father-in-law?

When mourning for your loved ones, you can only call your elders by their first names, such as writing a sad mourning for your loved ones and writing your own name directly in the next paragraph. If you are a junior, you can write your name directly in the next paragraph, such as from your nephew, or from your nephew, with the name XXX. You can also write your own junior, or your junior's name.

As long as you write your name and relationship clearly when mourning your loved ones, you can fully express your grief and respect, and people can see it at a glance.