(Original Publication Date, 9 May 1991)
Panel 1: We find ourselves in the middle of a conversation about Fiona that John and a legitimately distraught Elly are having. John would have to be made of stone to be unmoved by Elly as she lists Fiona's offenses: she smokes in the house, she's messy and lazy and her cat prowls the kitchen.
Panel 2: As Mike and Liz look on, she makes a nonsense of Fiona's complaint about how indirect she was about telling John to send her packing by telling a clearly reluctant John point-blank that he has to tell Fiona to leave NOW!!!
This is because Fiona was never in the room when Elly delivered ultimatums and also only ever got the face with the apologetic smile on it.
Panel 3: We see why it is that Mike learns that he can bullshit his way into parading around like he owns the joint in sixteen years' time when John whines that Fiona is his cousin! He can't tell a relative to leave because who knows what his family will think of him. He should see what their baffled reaction to that means but since he lives in fear of all of the fogeys back in Manitoba and Alberta think, he doesn't.
Panel 4: This is why the broad smiles on his immediate family's face confuse him; it never occurred to him that they don't give a rip what people they've never met think.
Summary: My guess is that we're looking at Lindy wanting to 'win' an argument about Aunt Margaret showing up at what's supposed to be just her family's vacation and also her trying to tell dead people that another dead person should have been content to sleep in the basement on a torture rack-like sofa bed.