Is it permissible to deny parents?

The Prophet (ﷺ) said, "Whomever attributes himself to other than his father or other than his family, may the curse of Allah and the angels and the people befall on him. Allah will not accept from him tawbah or compensation."[1]

In another hadith, "Whoever attributes himself to other than his own parents and he knows it is a kafer."[2]

And "Whoever attributes himself to other than his father and he knows it, Jannah is haram upon him."[3]

Reference:

[1] (Bukhari and Muslim)

[2] (Bukhari and Muslim)

[3] (Bukhari and Muslim)