Humanitarian Reinstatement

[ykowalski 11]

Hello everyone, 

My grandfather was a US citizen but he passed away in 2016. He started a petition for my mom (daughter married) back in 2008. The I130 from 2008 was approved and it was sent to NVC waiting for priority date. My parents' priority date is not gonna be current for another two years. 

My aunt, my mom's sister is also a US citizen and she agreed that she can be reinstated as a replacement petitioner. 

 

I've been doing some reading online and it seems like HR success rate is very slim. 

 

Question is: 

1) Should my mom send NVC a letter before her priority date becomes current, or should she wait for her priority date to become current then tells them that the petitioner has passed away?

2) What are the chances of this getting approved? My aunt has no problem becoming the new petitioner. 

 

I should also mention that both of my parents are Canadian citizens now so it's not like they are from a war-torn country. However, when the I130 was filed, they were filed based on their previous nationality. In other words, they were naturalized as Canadian citizens after the i130 NOA2 was received. 

 

Thanks in advance.