green card through mom

[willinghope]

my sister is in the US on visitors visa and my mom is a citizen. She intend to file for my sis who has decided to extend her stay. Is this advisable?

 

[great guru]

my sister is in the US on visitors visa and my mom is a citizen. She intend to file for my sis who has decided to extend her stay. Is this advisable?
Once green card is filed, she may not get a chance to come to USA until her green card isapproved - take 7-8 years for married son./daughter category now