When a marriage is truly successful it means it is successful on seven planes….that is why it is often called ‘saat janam ka rishta’ and why couples take ‘saat phere’ when they get married.
In pranic healing terms the seven planes refer to the several chakras of each spouse i.e. spiritual (crown and forehead chakras), mental (ajna and throat chakras), emotional (heart and solar plexus chakras), sexual (sex chakra), material (basic chakra). When the size of and the chords between the respective chakras of the two spouses is equal then the relationship is more harmonized and is tending towards divine union between two souls.
For other relationships (parent/s-children-sister/s-brother/s-uncle/s-aunt/s-friends etc.) to be successful most of these charkas maybe involved indirectly.