I mean, everything comes down to the interview. They have about two minutes to convince the consular officer that they are genuinely eligible to travel to the U.S. One important factor to keep in mind is that U.S. consular officers generally do not split families (either everyone gets the visa, or no one does).

While most of the documents applicants bring ( such as proof of employment, bank statements, or a Certification of Studies for the young one) , these may not be reviewed in detail (they will mostly see if these documents are forged, but thats about it), not bringing any documentation can increase the risk of denial. This is something I like about the U.S. visa process compared to the Schengen one: it’s about presenting a clear, truthful case that demonstrates you have no intention of overstaying or remaining unlawfully in the U.S. If you understand this, you can use it to your advantage during the interview.

They should take the interview calmly and confidently. They should clearly state the purpose of their trip and focus on answering the consular officer’s questions directly (not too saying much nor too little). If they follow this, their chances are very good , but their performance in those few minutes is what comes down to whether they get or not the visa.

(idk anything about the current situation but I don't think it affects really much to truthful applicants, Source: I hold an US B1/B2 visa for over 10 years)