Dracula still has the human element of Gabriel Belmont during his interactions with the younger Trevor. While he's pissed off at God, and is willing to prove himself more evil than Satan, he still genuinely loves his son.
At one point, Dracula strokes the White Wolf that guides him between his past and present on the head.
At another point, when collecting shards of the Mirror of Fate for the younger Trevor, he encounters the Toy-Maker. Despite being, well, Dracula, and despite the Toy Maker trying to kill him under the influence of the castle's corrupted blood, our protagonist ends up sparing his life after returning his clockwork heart to him, and encourages him to look after his humanity.
The Mirror sub-plot in general—even through it amounts to collecting pieces for a board game that younger Trevor's playing, Dracula does it anyway, speaking gently and patiently. To see the Prince of Darkness acting in such a fatherly fashion is one of the signs that somewhere in that monster's heart, Gabriel Belmont still exists.
Even if he calls him naive for believing in the Brotherhood's plan, Dracula can only speak of his old ally Pan with the utmost respect.
And he tries to talk Pan's brother, Agreus, out of fighting, not wanting to kill him. Considering that this is Dracula we're talking about here...