After she started looking into what, specifically, he had on the whole Autistic spectrum, it occurred to her that she didn't actually know when or where he got Lexican, the medicine he'd been taking since she knew him.
So she asked him, and he told her that his mother sent it once a month.
At first she thought that was strange: He was, in her estimation, perfectly capable of going to the pharmacy once a month to get a prescription. On the other hand, he really, really
didn't like change in his routines, so this was probably one of those things that it was just too much trouble to change.
But as she did her research on Lexican, it became kind of mysterious: It wasn't in general available anymore. Online conspiracy nuts linked Lexican to all sorts of things, including everything from Ebola to AIDs and even Autism itself. One coo-coo-bird even promulgated a theory that it actually caused
So she decided to call the mother and ask her about the Lexican.
The mother was...well, not exactly evasive, but she couldn't help think that the mother was trying to hide the appearance of being invasive.
Of course, daughters-in-law (or prospective daughters-in-law) never really got along with mothers-in-law (or potential mothers-in-law), so maybe her feelings just boiled down to a Freudian thing, like competing for maximum female influence over their shared man.
But no. At least, there was a part of her she trusted that told her something else was going on. For instance, the mother claimed she just got the Lexican from their local pharmacy in rural PA, and had been doing so since he was small. And yet, the internet claimed that Lexican had been discontinued many years ago, declared ineffective and not worth the side effects. She even called their pharmacy, and no one there had heard of it. In fact, their most tenured pharmacist had only been working there five years, and she believed him when he sounded confused: He'd never even heard of Lexican, never mind dispensed it.
So late on a Sunday night she sat there thinking about what to do. Did she really want to upset the applecart? This appeared to be one of those things that she should just leave the fuck alone, before she ruined what was a pretty good thing. Why rock the boat? She was just being paranoid.
And yet, she knew that her feelings about this whole thing weren't going to just evaporate. In fact, they'd get stronger and stronger until she started taking it all out on him, and she knew where that would lead, in a hurry too.
But she couldn't call the mother, that much she was sure of. She couldn't just say, "I called your pharmacy and they never heard of Lexican,". The answer would probably be embarrassingly simple, and then she would have lost the trust of both the mother as well as him too. And taking away the pills was not an option: Aside from potentially disastrous side-effects (assuming they really were helping him), he would respond terribly to the change in routine: "Where's my medicine? I haven't taken my medicine. Can't go out without my medicine. Where's my medicine? I need my medicine." It would really throw him a curveball, and he couldn't handle curveballs.
So what could she possibly do?
She knew what to do: She'd go find some way to make fake pills and let him take those for a while to see what happened. And if there was a bad result, she'd just switch them back for real ones.