Visa concern - family already in the US

[historykeeno]

I've been admitted to a PhD program at a reputable US grad school with full funding. I am from the UK but members of my immediate family recently moved to the US and now have permanent residency. This did not influence my decision to apply to the United States, but I am concerned it could be a problem at the visa interview - particularly when it comes to proving that I intend to return to the UK after I finish the program. Just wondering if anyone could shed some light on how much of a problem having family already in the US can be? Thanks!