I have these tables
person table with following data
person_id description
1 first in the family
2 SON OF PERSON 1
3 SON OF PEROSN 2
4 SON OF PEROSN 3
5 SON OF PERSON 4
6 SON OF PERSON 2
7 SON OF PERSON 3
8 SON OF PERSON 3
9 SON OF PERSON 7
person_name table with following data
person_id first_name
1 Santiago
2 Lautaro
3 Lucas
4 Franco
5 Agustín
6 MOLE
7 BULLY
8 CIVAL
9 NUMA
father table with following data
person_father_id description
1 father of Lautaro
2 father of Lucas
3 father of Franco
4 father of Agustín
7 FATHER OF NUMA
children table with following data
person_child_id person_father_id
2 1
3 2
4 3
5 4
6 2
7 3
8 3
9 7
HOW TO GET RELATIONS BETWEEN FAMILY FOR EXAMPLE THE UNCLE OF PERSON NUMBER 4. AND THE NEPHEW OF PERSON NUMBER 2 AND THE GRAND FATHER OF PERSON 4