What we also know is that Rod and Lynn seem to have spent an inordinate amount of time at cross purposes because she had to have things her way and really doesn't seem to have especially trusted him or especially cared what made him happy. Given that Lynn and Anthony are pretty much the same, it could well be that while John and Elly believe their daughter to have had a happy ending dancing away with a swell guy with a good head on his shoulders, the truth is less reassuring. It could be that Francie is currently a target of opportunity because Anthony just plain ain't around when Liz is in a dumping mood.
Given that Liz doesn't like making waves and doesn't like to consider evidence that's predicated on her having blundered into making a huge mistake, this sort of messy situation could probably last for years until Anthony simply goes too damned far and breaks one promise too many. By that time, it's pretty much a given that the two people who spend most of their free time telling her how great Anthony is and how bad Paul and Warren were for not dropping everything to run to her like they're supposed to would be more or less ten pounds of combustion fragments in ceramic jars some place. Since John and Elly were really the only thing keeping Liz from straying, she'll simply disappear from his life leaving a helpless, confused man to be cleaned up after by someone else because they won't be around to tell whine about how ungrateful she's being.