Derek's Earth mother had done nothing to protect him and Carl from the abuse while Ezio was alive.
After his death, she had cut her children out of her life, blaming them as the source of her misfortunes and resenting them for taking two-thirds of the settlement that she considered entirely hers.
It was the reason Derek had come to forget her name.
She wasn't a person and as such she didn't deserve one.
On top of that, Derek considered those feelings of love and acceptance like weakness, and weakness was an unforgivable sin.
If not for the hunger, the Void would have never entered Mother's Embrace, no matter how much he needed it. The construct closed its arms, bringing the smaller figure of the Abomination to its bosom.