Re: What was the family relationship between Hazrat Umar and Hazrat ali ?
Islamically speaking, there is no relationship. Your stepmothers father will never be your grandfather. So if Hz. Umar’s daughter was married to Hz. Mohammad (PBUH) and thereby Hz. Fatma’s stepmother, it doesnt make Hz. Umar the grandfather of Hz. Fatma’s children. Common sense. All these relationships are duniyavi, they have no meaning in Islam. Just like if your mother remarried a man with already daughter from a previous marriage, it would make his daughter your stepsister, but in Islam you can marry her.