Pretty sure there have been more episodes, sadly, And you can see Janelle think "Oh whoops, I'm on Teen Mom, better look like I want my kid back". It creeps me out how much Nathan wants Jace actually, especially since he doesn't seem to care about his own daughter nearly as much!
And I agree, Barb isn't mother of the year material but someone had to step up for the poor kid. I remember being horrified when Janelle came home, high as a kite, she and Barb were screaming at each other as Barb threw her out (for somethingth time) and it cut to six month old Jace sitting at the back door, entertaining himself with a spoon or something and looking heartbreakingly lonely. Whenever Janelle has gone on about how much she loves him, I always think of that episode.
I'm a bit younger than the girls and when I told my parents about how the grandparents were raising the kids, they were horrified at raising a toddler at their age. It isn't fair that the grandparents are having the pick up the slack and I can definitely see Kaiser going to Barb's or Nathan's parents. It will be a case of, "should he be raised with his half-brother and his grandmother or his half-sister and her grandparents?". Either way, none of those kids have been set up for good mental health in the future. Out of all of the Teen Moms, Janelle just makes me so mad!