When the child was to grow up, he died `` From old age. ‘’ Very sorry 
(There may be trouble with the translation)
Can you precise what language do you use and if you can describe how he died (if you know or can) please ?
@Evan welcome to the forum. You’re probably using an old version of Founders’ Fortune.
The current version is 12.2.3
I recommend activating your game on Steam and turning updates on 
What language? Russian. The child just had to grow up, but died. The reason is old age. Restarted the world several times, but to no avail
If you are playing on an old version, it’s not going to work.
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I switched to the new version, everything is fine! Thanks.