A couple things: First, I am so glad that her husband is with her on this. We have seen similar(ish) stories in which husbands side with their crazy parents over their partners, and that makes things ten times harder. It is so important that they are on the same team here.
Likewise, the fact that they are in therapy together just made me want to hug them. So many stories I read on Reddit make me want to take an elevator to the roof of the highest building in the world, step out, and scream, “Go to therapy! It will help!” The fact that this couple knew they needed help to deal with the tragedy of losing their son is so, so good.