In The Name of Allah, The Most Merciful, The Bestower of Mercy.

Justice is equity. The one who bears witness, it is obligated to him to establish his testimony on truthfulness, justice, fairness, integrity, and precision, and bears witness even against himself. Allah has obligated to (His) servants to bear witness even against themselves, their fathers, and relatives. With great sadness, I think this example is very rare. With great sadness, the one who bears witness against himself or relatives is very rare. With great sadness, even with regards to one who claims (to be upon) Slafiyyah, when trials occur, he forgets to testify for Allah. I say (this) about the one who claims to be upon Salafiyyah, whereas  the truthful Salafi fulfils testimony for Allah, The Blessed and Exalted; speaks the truth, aids the truth, and testifies to truth. A false (bogus) Salafi is exposed by trials, exposing their true reality and fakery. Therefore, be witnesses for Allah, even if it is against yourselves, parents or relatives.

Nafhat Al-Huda Wal Iman 128