This is not a comment on you, but I do the same thing and have come to realize it’s at least in part a response to being judged in some way (or feeling judged at least) over things I shared with my family, so now I just don’t share.
If it’s important to you, it might be worth having a conversation about why they are withholding and, if it’s for similar reasons, addressing why they feel that way and assuring them you’ll do your best to keep them from feeling bad about sharing.