There’s a sentence ‘Yes the boy is fifteen and the girl is ten’ ‘Oes mae’r bachgen yn bymtheg ac mae’r ferch yn ddeg’ (17:30)
Why is it oes for yes? I presume question would have been ‘Pam mor hen ŷ nhw?’ so wouldn’t yes be ydy?
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Well spotted. But as it happens, the actual question is at 17:17, just before the answer. It is “Have you got children yourselves?” using “Oes” at the start of the question, so it is OK for you to answer using "Oes, " implying “Yes, we have…”
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Ah that makes sense now! Diolch 
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