You know, in the alternate timeline from Eyes Of Heaven, I always have to wonder if Jotaro's a better husband too. Because it seems that he's taking the steps to be father to Jolyne if the ending's any indication.

Potentially. He realized that if Jolyne isn't cared for, then everything goes to shit because she's in Green Dolphin Prison, thus helping Pucci accomplish his goals. Here, he tries to make Jolyne better, and I theorize he'll attempt to awaken her Stand early on so she can learn to use it better by the time Pucci goes into action. Yes, he's weaponizing his own daughter, but against a guy who wants to reset the universe, anything goes.