What Kylo says doesn’t have to be true, he’s just playing things up to get in her head. But, Rey’s parents could have totally been afraid of a baby that they didn’t conceive, especially one that exhibited strange powers as a child, like Anakin did with his racing. Maybe this is an result of Imperial propaganda painting the Jedi as evil. Rey didn’t even know if Luke is a real person in TFA, so their access to information is probably restricted on Jakku. Although, perhaps using “mother” or “family” instead of “parents” because I can’t imagine Rey’s dad believing his girl saying she got pregnant for no reason. The lines about Palpatine using the force’s reaction to his resurrection is sort of hard to grasp because it’s not really tangible, at least for me. I think it’s better to just leave it vague.