There is actually nothing wrong in addressing the grandfather with the word abi, abb, abu, or the like. If you refer to the Quran in Arabic, you will find in Surat al-Baqarah 2:133 the Arabic word abaa` (plural of abb (father)) is used for the father (Isaac), grandfather (Abraham) and even referring to the uncle (Ishmael).
Is Addressing a Person’s Father with the Arabic Word ‘Aba’ Permissible?
Did you like this content?
Recommended
Making up for Missed Fasting Days in Shawwal
Advice to Overcome Porn Addiction
Making Up for the Missed Fast Days Before the Next Ramadan
Fasting on Friday if it falls within the Six Days of Shawwal
Is Masturbation Considered Zina?
Gold and Pure Silk Are Forbidden for Men: Why?
Making up for Years of Missed Prayer
Dayyuth: His Description and Testimony
Disobedient Wife, How to Deal with Her?
Falling in Love: Allowed in Islam?
Top Reading