how toretrive staff_designation from one child table to another child table with one parent table

guys iam working with a school project.

i need to insert staff details so what i did is

i had a form which creates an account for staff and then other details in other table

users table below

id
user_name

official_info table

id
staff_id (fk from users table)
designation

here users in parent table and official_ info is child table

now i have another problem

i have an attendance table where columns are

id
staff_id (pk from users table)
att_date

now whats my problem when i display the attendance i need to display the staff_designation also.

for name i did like this

$attendance->staff->user_name   (as it is directly connected to user table)

but designation is in official_info table which is a child table then how?

simply to say user is parent table and attendance and official_info are child table. how can i access the official_table info by attendance table??

Kindly some one help please

my user model

 public function staffofficial()
     {
         return $this->hasOne('App\StaffOfficialInfo', 'staff_id');
     }

  public function staffattendance()
     {
         return $this->hasmany('App\StaffAttendance', 'staff_id');
     }


my staff attendance model

  public function staff()
    {
        return $this->belongsTo('App\User', 'staff_id');
    }



my official model

 public function user()
    {
        return $this->belongsTo('App\User', 'staff_id');
    }