亡くなった父は私の母が再婚した３人目の父です。って英語でなんて言うの？

「亡くなった父は私の母が再婚した３人目の父です。」＝　My father who died was my mother's third husband. / The man who died was my mother's third husband.

「その父は本当の父以上の存在でした。」＝ He was more of a father to me than my biological father. / Even though he wasn't my biological father, I consider him to be my real father.

ボキャブラリー
father ＝　父親
died ＝　亡くなった
mother　＝　母親
third ＝　3人目
husband ＝　夫
biological father, real father ＝　本当の父
more ～ than ＝　～よりも
even though ＝　～だが
consider ＝　～だと思っている