Immediate family, very close/trusted friends, girlfriend/spouse. I believe NONE of them should know that you're active in Bitcoin or any cryptocurrency, or you're a shitcoin trader.
Do you think the same way about fiat or anything else of value that you have. I guess you work somewhere and you are paid a certain sum every month. Is that also something you think should be confidential and not shared with immediate family? Many partners open join bank accounts because it's easier. A family makes big decisions together. That also includes investments. I don't they should be kept in the dark and that the bitcoin should die with you.
Having said that, I also have certain rules. My family knows what to do and where to go for the backups to recover my digital assets. But they don't have my permission to do it. More precisely, they can't do it for the fun of it, or to see if it will work, etc. And while I am alive and healthy, I am the one that works the crypto thing. It might sound silly, but they respect that. It wouldn't take me long to notice they have accessed the hiding places depending on where we are at the moment. And we are usually in the same places.
I don't think we are talking about the same thing actually, you seem to talk about funds/investments belonging to your couple/family while Wind_FURY and me are talking about your own funds, money that you want to keep for yourself. If someone wants to "target" you as BlackHatCoiner says because you owe him money or because you're wealthy. Don't you think it would be unfair that he tries to target your wife or your children instead of you, because he knows or he thinks you are the kind of guy sharing your crypto seed with his family and it will be easier to use social engineering tricks on them or worse things? Sharing things with people can expose them to dangers related to those things unfortunately.