I believe it’s a known limitation by the weweb team, based on a previous post. How can I filter by date from a collection where the date is part of an addon from Xano - #3 by MichaelLovell
Not seeing the data structure but making some assumptions, switch to the javascript formula and try something along the lines of this…
// Access the global variable containing the data Family
const items = collections['your-collection-id...de439c6947c9']
// Filter the items based on the 'family_member.id' property
const filteredItems = items.filter(item => {
return item.family_member.id === user_id;
});
// Return the filtered items
return filteredItems;