We have to wait a bit. That's because we have to get Lizzie walking around first. That's because we know she was walking BEFORE John and Mrs. Baird double-teamed Elly.
Panel 1: We start off with exhorting Lizzie to let go of the table and walk towards him.
Panel 2: He's encouraging her to do so because, unlike Elly, he knows that she can walk.
Panel 3: She takes another set of tentative steps.
Panel 4: An elated Mike, unaware that his ultra-loud voice frightened Liz, tells Elly that she's walking around now.
Panel 5: We see Elly's silhouette glare at him because when got in, Lizzie landed on her rump so hard, a storm cloud developed over her head.
Summary: This is pretty much where Mike starts to regret having a kid sister, I'd say. NO matter what he does to help it's seen as being bad by his idiot mother. Since he can do no right as far as Sistwirp in concerned, his excitement at the prospect of being a big brother will quickly be replaced by hate. Simply put, Elly's short-sightedness kept her from having the harmony she craved.