Less than 0.1%
If you have no green card, for your mother: 80%; If you have GC, for your mother: 50%.
For your sister: less than 1%; for your sister's kids: less than 0.1%.
If you have no green card, for your mother: 80%; If you have GC, for your mother: 50%.
For your sister: less than 1%; for your sister's kids: less than 0.1%.