Blessings for a Martyr of Islam

[samuraimomin]

One of the six rights martyrs get in Islam is to plead for seventy of their relatives.

What if the relatives were not Muslim?

Why will Allah Swt grant them Jannat anyways?

Jazakam Allah Kheiran.Salam Alaikum. Wr Wb.

[AbdulQahhar]

One of the six rights martyrs get in Islam is to plead for seventy of their relatives.

What if the relatives were not Muslim?

Why will Allah Swt grant them Jannat anyways?

Jazakam Allah Kheiran.Salam Alaikum. Wr Wb.

where did you get that? That Allah will grant Jannah to the nonbelieving relatives?
You can try to count how many times in the Qur'an Allah explicitly says that kuffaar will not go to Jannah, and don't even try to count all the Ahadith on the subject, bcoz there's too many.