Can we also show our bitcoin key to someone closer, maybe love, spouse, next of kin?
Better still between someone; who introduced and taught you about bitcoin, a friend or family member and your children who's most preferred and reliable person to give out our information about your bitcoin?
It makes no sense to give someone else your private key and giving someone else your private key or seed phrase will give them access to your assets. You should carefully consider giving out the private key to someone else, as the risk of losing assets is much greater.
It's another case when you intend to bequeath these assets to your children or wife, I intend to give them full access rights someday, but first provide an understanding so that when they have access they don't use our assets for things that are harmed, for example such as selling to unfavorable conditions.