4級姪
綴り規則 "i before e"
niece, believe, friend, piece, achieve, retrieve は i が先。
例外 (e before i): receive, ceiling, eight, weight, height, heir。
家族の世代別整理
上世代: grandparents, parents, uncles/aunts
同世代: siblings (brothers/sisters), cousins
下世代: children (sons/daughters), nephews/nieces, grandchildren。