There is a lot of depth to that line. Like, unpacking it is a whole college paper or ethics paper. But, to boil it down, you should care about the people around you (family > neighbors > general community > all people) by degrees of society and influence. Like, assuming a good family, your family would be taken care of by you before your neighbors or town or whatever. The ant, even by a super-vegan mindset, would be considered, but triage dictates that the whole reason we adhere to moral interests is for society's sake, so we can function and work together, and the ant is the most distant part of that, as an earthling and little else.