The word(s) "rightful" appears 2 time(s) in 2 verse(s) in Quran in Mohsin Khan translation.

(1) There! Every person will know (exactly) what he had earned before and they will be brought back to Allah, their rightful Maula (Lord), and their invented false deities will vanish from them.

(سورة يونس, Yunus, Chapter #10, Verse #30)
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(2) They have not estimated Allah His rightful Estimate. Verily, Allah is All-Strong, All-Mighty.

(سورة الحج, Al-Hajj, Chapter #22, Verse #74)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)