プログレッシブ和英中辞典(第4版)の解説
ふなか【不仲】
彼は弟と不仲である
He 「is on bad terms [has had a falling out] with his brother.
彼は妻と不仲である
He and his wife 「don't get [aren't getting] along very well with each other.（▼aren't gettingは一時的に不仲であるかも知れないというニュアンス）
彼は父親と不仲になった
He became alienated [《文》 estranged] from his father.