The US Embassy Consulers are a bunch of incompetent people who issue a visa with a roll of a dice. I have enough evidence. Family tie reason is BS.
I knoow few people whose entire family (including siblings) are in US and got the visa and I also know people whose visa got denied who have business in Nepal, No one in Nepal and genuinely did not want to stay in the US. Hopefully, you will get lucky. Good Luck.