Formula of blood relation

Father’s side                                                    –  Paternal
Mother’s side                                                   –  Maternal
Mother’s or Father’s Father                             –  Grandfather (Maternal or Paternal)
Mother’s or Father’s Mother                            –  Grandmother (Maternal or Paternal)
Mother’s or Father’s Brother                           –  Uncle
Mother’s or Father’s Sister                              –  Aunt
Mother’s or Father’s Son                                 –  Brother
Mother’s or Father’s Daughter                        –  Sister
Son’s Wife                                                       –  Daughter-in-law
Daughter’s Husband                                       –  Son-in-law
Husband’s or wife’s Father                             –  Father-in-law
Husband’s or wife’s Mother                            –  Mother-in-law
Husband’s or wife’s Brother                            –  Brother-in-law
Husband’s or wife’s Sister                               –  Sister-in-law
Sister’s Husband                                              –   Brother-in-law
Brother’s Wife                                                  –   Sister-in-law
Brother’s or Sister’s Son                                  –   Nephew
Brother’s or Sister’s Daughter                         –   Niece
Uncle’s or Aunt’s Son or Daughter                  –   Cousin (He is considered as First Cousin)
Son or Daughter of the First Cousin                –   Cousin (He is mainly addressed as Second Cousin)
Grandson’s or Grand Daughter’s Son               –   Great Grand son
Grandson’s or Grand Daughters’s Daughter     –  Great Grand Daughter
Father’s or Mother’s Aunt                                –  Grand Aunt or Grand Aunt
Father’s or Mother’s Uncle                              –  Grand Uncle or Great Uncle
Real Brother or Sister (Common Parents)       –  Sibling