"Tad yng-nghyfraith"

Translation: A father-in-law

[AneurinEE]

What's the literal meaning of yng-nghyfraith and how do the mutations work?

[areddragon]

In this case, the first word is yn (in), and the second is cyfraith, meaning law. The yn causes a nasal mutation, where:

• yn -> yng
• c -> ngh

Which means, yn cyfraith goes to yng nghyfraith.

[AnUnicorn]

Any idea if these terms arose independently in Welsh, or if they were calques from English?

[AneurinEE]

Great, many thanks!