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How can we say 'Neeta is my only sister' in hindi?

How can we say 'Neeta is my only sister' in hindi? 
Nee-Tahi-Buhn hai hamari.
     First of all, I have written something. (Sorry for the mess, dadi🤧)

Dadi maa dadi maa, 
Pyari pyari dadi maa,
Dekho jara ise dekho
Celebration karo dadi maa. 
Dadi maa dadi maa, 
Pyari pyari dadi maa,
How can we say 'Neeta is my only sister' in hindi? 
Nee-Tahi-Buhn hai hamari.
     First of all, I have written something. (Sorry for the mess, dadi🤧)

Dadi maa dadi maa, 
Pyari pyari dadi maa,
Dekho jara ise dekho
Celebration karo dadi maa. 
Dadi maa dadi maa, 
Pyari pyari dadi maa,