The real amity and enmity will be manifested on the Day of judgement
About the advent of real amity and enmity in judgement Day, many koranic verses are revealed, some them as follows:
Once the trumpet is blown, no ties of kinship will exist between them not that day, not may they question one another. (23:101) when then uproar comes on a day when man will flee from his brother his mother and his father , his mate and his children , every hast man among them will have enough concern that day to keep him occupied (80:33-37)
On that day even bosom friends will become one another enemies unless they have done their duty. (43:67)
Sources :
"Recognition of Resurrection" (Allameh Tehrani)
English translation of the Koran (T.B. Irving)
https://tahoor.com/en/Article/PrintView/400341