After all, we don't know the age and subtleties of his relationship with his mother, so why condemn him. That's not why he shared his story. I am sure that OP has already heeded to many constructive advice given to him in the discussion of this topic.
Are you offended? I did not mean to offend, but I read all the posts and was surprised by the variety. Simplicity will save the world. Have you heard about it? You don't need to reinvent the wheel to store your seed phrases. You just need to be careful. Likewise, you can also lose a piece of metal. In the same way, Mommy will throw away a piece of paper with colorless ink, so there will be nothing to reproach her with.
The age of the account suggests that the OP is not a child, registered in 2016, and he is still at a loss about storage. Do you really believe it?
And also, I just imagined an evil mother who would not listen to her son; nevertheless, she would carefully clean his table.
There can be no 100% perfect and safe way to store anything, including recovery phrase. Anything can be lost, be it a piece of metal or paper. But in the context of the title of this topic, all the same, we are talking about paper as a way of storing seed-phrase, so there were thoughts about using colorless ink. Whether to use this option or not is a purely personal choice.
The date of registration is not the date of birth, and theoretically, it is possible that this account was created, for example, by a teenager in 2016, who now lives with his mother (who, due to the elapsed time, has already become older, but still young for an independent life). Do I believe in the story told by OP? I can't know the truth of what happened, but until your comment I saw no reason to doubt it. Now a seed of doubt has been planted, but that doesn't matter anymore.
If don't dwell on the evil mother, then any family member or close relative can accidentally throw seed-phrase away, lose or destroy it. For example, children who randomly find it written on a piece of paper and not realizing the importance of this will make the text unreadable during the game. And with regard to the caution expressed by you, I can only agree, but I want to add that it would be appropriate to restrict access to written seed phrase to any close person who is not aware of the purpose of this. Harm can be committed without malicious intent and premeditation, but for the simple reason of not knowing and banal accident.