score:0

you can map over familymembers array and update when you find user.id and update that avatar.

const users = current(state.data.familymembers)
const familymembers = users.map(user => {
    if(user.id === id) {
       return { ...user, avatar };
    } else {
       return user;
    }
}
const userindex = users.findindex((user) => user.id === id)
return {
  ...state,
  data: {
     ...state.data,
     familymembers: familymembers,
   },
};

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