I watched my father during his playthrough. He neglected them for a lot of the time. Didn't converse with them any more than he needed to in Ep3.
Similar again but very little negativity seemed to flow between Lee and Christa or Omid.
Although Lee was dishonest. He lied to Vernon about having meds, which I'm sure is an action someone like Christa wouldn't agree with. He also hid his bite.
He declared ASAP that he would go alone and had no objections.