https://www.loc.gov/item/global-legal-monitor/2013-09-24/japan-supreme-court-gives-out-of-wedlock-children-equal-inheritance-rights/
这边是日本规定,日本在2013年之前。非婚生子女只有1/2继承权
https://www.mofa.go.jp/policy/human/child/report2/right.html
138. An illegitimate child has rights and duties in relation to his/her legal parents, prescribed by the Civil Code of Japan on the parent-child relationship including a right to be supported and duty to support them as well as the inheritance rights enjoyed by the first-order inheritor.
这是有关德国的内容
https://www.famrz.de/files/Media/dokumente/pdfs/JudgmentMitzingerv.Germany-inheritancerightsofchildrenbornoutsidemarriage.pdf