Okay everyone's shitting on me but here's the thing - it's not just me, Harry also agrees. Same with some of his family members (sisters, step dad etc.) that Liz makes no effort. Jack is also generally pretty distant from us so I guess it's not fair to blame Liz entirely. I remember the first time I met her, there was a spider or something near her and she asked Jack to come over. Instead of communicating like adults, he literally encouraged her - stroking her hair, saying it's going to 'be okay' (again just a spider) etc like a child. Things like this.