I started a family group and sent messages to those people. But when they click on link they get a message that I must enable the relationship. But that is already allowed in my permissions. What am I doing wrong?
I don't think you're doing anything wrong, but there is still one more step for you to take before these members become part of your group, and that is as the administrator, you need to approve their request.
You send the invitation, they apply, and you approve.
Here is a Knowledge Article that probably explains it better. Click on the link , or copy and paste it into your browser.
I am just another 'lowly' User/Patron ...
[ And, I happen to be a Member of the Church ... ]
Just in passing ...
Further to; and, in support of, what 'Barry' has already proffered ...
You, may have, "Relationship Viewing"; as, "Enabled" ...
That Said ...
The OTHER members, of the particular "Family Group", MOST likely, DO NOT, have their "Relationship Viewing"; as, "Enabled".
It is more likely, that the OTHER members (or, invited, potential, members), of the particular "Family Group", have their "Relationship Viewing"; as, "Disabled".
"Relationship Viewing", has NO bearing, on "Family Groups"; especially, in relation to the members of the group.
Hence, WHY, an [or, at least, one of the Three (x3) possible] "Administrator(s)", of a "Family Group", is "Required", to "Approve"/Authorise", the NEW invited members, once they "Accept", their "Invitation", to "Join", the "Family Group".
As an aside ...
It is best NOT, to leave, "Relationship Viewing"; as, "Enabled" (ie. ON), "All" the time.
"Relationship Viewing", SHOULD, be just "Turned" both, ON; and, OFF; as, required.
That is for "Privacy".
Just my thoughts.
I hope, that this may help/assist, somewhat.