الأَبَوَانِ
The two parents: father and mother.
الْقَمَرَانِ
The two luminaries: sun and moon.
الْعُمَرَانِ
Abu Bakr and Umar, may Allah be pleased with them.
These established expressions use the name of one member to refer collectively to two. The first is based on “father”, the second on “moon”, and the third on the name Umar.
They are conventional Arabic expressions; one should not invent arbitrary duals for any pair and claim established taghlib.
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Conclusion: Departing from the Apparent Demands of Context
الأَبَوَانِ
The two parents: father and mother.
الْقَمَرَانِ
The two luminaries: sun and moon.
الْعُمَرَانِ
Abu Bakr and Umar, may Allah be pleased with them.
These established expressions use the name of one member to refer collectively to two. The first is based on “father”, the second on “moon”, and the third on the name Umar.
They are conventional Arabic expressions; one should not invent arbitrary duals for any pair and claim established taghlib.