effect on relationship between two sisters due to the distance

My father filed an family based immigration petition for my sister who is reside outside US. Based on the US immigration law, petition get canceled if petitioner deceased and that is what happened in our case. My father died last year and now we are requesting immigration to continue with his petition rather than canceling it. In order to do that, we need to provide letter to US immigration explaining following:

How this long distance relationship affect both of our sisters relationship (me and my sister abroad)?

 
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