Visitor Visa - B2

Hi guys, I'm a 34 year single female with no travel history. Have applied for B2 visa to visit my aunt in the U.S alone. I'm a bit confused as to what to state as the reason for my absence of travel history. The main reason being my mom's medical condition for the last 7-8 years due to which I had to be around her to take care of her and along with my sibling and father. The other reason is also that my parents don't really like travelling a lot due to which we haven't visited my aunt (mom's sister) despite her being in the U.S for more than a decade now. Please guide me if I should just state that my parents and me don't really like travelling hence the absence of travel history or mention about my mom's medical condition or both?! Highly appreciate any help on this! Thanks in advance.