It is not suitable for the Prophet and those who have believed to seek forgiveness for the Mushriks even if they were relatives after it has become clear to them that they are companions of Hades.
As explained in verse 3: 7, the Arabic Qur’an reading Fujjar/Kuffar are the real disbelievers and Mushriks. Their ledger is in Sijjeen as told in verse 83: 7. It is told in verse 82: 14 that indeed, Fujjar are in the Hades. So, the believer who represents the Believer Lord can’t seek forgiveness for any hypocrites or their Mushrik followers who are living here as the representatives of Kafir Satan as explained in verses 9: 80 and 84-85. They are the real disbelievers as explained in verses 4: 150-151 who hide and reject Adhikr. They are the inmates of Hades as explained in verses 5: 10 and 86. The odd-believer is commanded to say the hypocrites who change the Favor of Lord—Adhikr—and made Halal the Hell (house of worthless) to their followers through verses 14: 28-30 as: “You enjoy here a little, then indeed, your returning is into the Fire”. It is repeatedly told 10 times in Surath 77: “Those who reject Adhikr have Vail valley of the Hell”. It is told to the Mujirims in verse 77: 46: “You eat and enjoy here a little”. It is permitted to seek forgiveness for the believers who are following Adhikr and are judging in their individual, family and social life with It. See explanations 2: 39, 159-161 and 9: 31, 78.