Grandfather-Father-Son
‘Grandfather-Father-Son’, as different to 'Grandfathered', is typically used to infer a level of age or hierarchy in infrastructure or backups, where ‘Grandfather’ is an older generation of technology, or backup, whereas ‘Son’ is a newer generation or copy
Why it matters
Typically infers that ‘Grandfather’ is old and takes longer to restore, whilst ‘Son’ is younger and quicker to restore. Also supports an idea of male lineage being stronger or preferred to female, especially in the context of legacy and leading a family.
Instead try saying:
Primary / Secondary / Tertiary
Further External Reading Link