Green Card for my Mom

[braghavendra]

I became a US citizen recently. I want to sponsor my siblings(over 21 year old), is it better to get my mother's green card and wait till she becomes a citizen and then apply of apply directly throough her ? What will be faster ? How long each of these would take for Indian Citizens ?

also, If they apply for tourist visa, having a GC application filed would be negative for them.
BR