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Can I say,

(a) Mr and Mrs Lim are a pair of couple. They have a son and a daughter. They are a wealthy family.

Their daughter has won many prizes in her school. Her parents are proud of her.

(b) Mr and Mrs Lim are a pair of couple. They are affectionate couple. They have a son and a daughter.
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"pair of couple" is tautology. They mean the same thing - two items/people.

Mr and Mrs Lim are a couple is the normal phrase.
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Vincent TeoThey are an affectionate couple.

CB
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I don't think you can say "a pair of couple".

Just say "a couple".
Thanks. So, others are correct? like "they are a affectionate couple"
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 Cool Breeze's reply was promoted to an answer.