Comic books and novels have confirmed that the two had busy lives following the events of Return of the Jedi, so it’s entirely possible that they may not have had an ample amount of time for their son.
Well, that’s certainly heartbreaking, to say the least.
Many Star Wars fans likely see Snoke’s manipulation as the major reason for Ben’s fall to the Dark side of the Force, but one may not have considered how Han and Leia’s upbringing may have contributed to it as well.