Yes, Even More on Parents and Sealings.
In regard Cain the Lord said,
"If you do well, you shall be accepted. And if you do not well sin lies at the door, and Satan desires to have you; and except you shall listen to my commandments, I will deliver you up, and it shall be to you according to his desire. And you shall rule over him; For from this time forward you shall be the father of his lies; you shall be called Perdition; for you were also before the world." Moses 5:23-24
Should we regard that such will be in the Celestial kingdom afterward: That the tentacles have reached out to save Cain? Will Cain repent? Of course not.
What of Lehi and Sariah with Laman and Lemuel? Are we to believe that we will be with Laman and Lemuel in the Celestial kingdom, repentance or no repentance? They will not become different people in the eternities. They have set their course as surely as Cain.
Or can a person commit the unpardonable sin and then be saved into the Celestial Kingdom because his father and mother were good people?