US Immigration from Kenya

Hi, my mother is petitioner for my sister greencard (F2A). The case is pending Embassy interview in few weeks. My mom spends quite some time in our country so she can take care of the younger sisters (she s single). My question is, can my sisters enter the US alone and my mom join in few weeks( she want to ensure everything goes fine before she sells property and closes business back home). She already proved domicile in NVC stage. Thanks.

I have the flexibility of working remotely and was wondering whether I could move to a city/state that has the shortest wait times for N-400 approvals? I can apply for naturalization end of July 2021.

Is this something possible to do?

Thanks.

The marriage that created a step-child relationship happened when the child was 18. They are now 20. As we are waiting for Covid to open up the local embassy, is it possible for me (USC) to start a petition to bring my step-child over? The way I read it online is that we will have to wait until the mom gets here and then she will have to file for them. I was hoping to have the case created before the child turned 21.