Question

Sony is Sana's sister
Sonu is Sona's mother
Sana is Sonu's mother
Sanu is Sana's mother

Then,
How is Sana is related to Sony ?​

Answer 1

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Sana is a grandmother. Her mother is Sanu. Her child is Sonu and Sonu's child is Sona. Her sister is Sony.

All in all :

Sanu's kids are Sana and Sony, Sana's kid is Sonu and Sonu's kid is Sona.

Thank you, Hope you understand :)