in English is:

seniority

Mutations

Soft:(no mutation)
Nasal:(no mutation)
Aspirate:(no mutation)

Use

yr hynafedd hwn
fy hynafedd i
dy hynafedd di
ei hynafedd ef/o
ei hynafedd hi
ein hynafedd ni
eich hynafedd chi
eu hynafedd nhw/hwy
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