This traditional naming system is difficult for the modern people to understand the due to the demise of Japan's traditional family system (that occurred with 1947 revisions to Succession and Domestic Relationship elements of Japan's Civil Code)..
そのため、（民法の相続編・親族編が昭和22年に改正され、イエ制度が崩壊してからは）現代人には分かりづらい制度になっている。