Ed Slushie said:
“Your father threw you away like trash, as did his father… Emperor Palpatine.”

I love that, that phrase makes Rey spiral towards the darkside much more belivable and in line with TLJ.

So it would be

A) Palpatine failure of son/clone, which was abandoned because it didn’t have the force, was a piece of s**t, sold rey for drinking money to Unkar Plutt without knowing that she had the force like his father, Palpatine senses Rey power once she grows up or the dyad and wants her dead or to obtain the Kylo/Rey dyad power to fully recover.

B) Palpatine failure of son/clone, which was abandoned because it didn’t have the force, was a piece of s**t, sold rey and to Palpatine which had a force vision of her power or the dyad in the force and thought about using that power to fully recover, Unkar Plutt was going to take care of her until she was old enough to meet kylo and for the dyad to happen.

I prefer A, i think is much more simpler than B