Generally-speaking, it is a standard practice in Japan that his/her family member/family members take responsibility for matters when the person concerned cannot do something on his/her own.
ご質問ありがとうございます。
"Generally-speaking"＝「一般的に言うと」
"it is a standard practice in Japan"＝「日本では一般的なルールです」
"that his/her family member/family members take responsibility for matters when the person concerned cannot do something on his/her own."＝「本人が出来ないことに関して家族が責任を取るということが。」
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アメリカ合衆国 
