I would guess Joni and Laser were left extremely confused and emotionally traumatized by the whole experience. I tried to imagine, for instance, how I would feel if my dad had an affair with another man. And once the whim had passed for him, expected my mother to welcome him back with open arms. No explanation offered for his sudden switch in sexual orientation. Being cheated on by your spouse is difficult enough as it is. But to suddenly have to question the most primal aspects of your relationship would be even more devastating.
The Kids Are All Right is a good conversation starter. It also would've made a great pilot episode to a potentially great television series. But as a stand-alone story, it feels woefully incomplete. Unfortunately the DVD's skimpy supplemental features shed very little light on the filmmaker's intent. Not that such features should be necessary; a well-told story doesn't require further elaboration. But the director's commentary and a couple of superficial featurettes aren't really worth the time.