For the sake of argument, I'll assign Georgia's family the surname "Weatherly" because I like Agent Dinozzo and her parents "Bob and Margaret" because, well, I like animated Britcoms about dull English people dying of culture shock because Toronto isn't Hounslow. If we were to look at her mother's Liography, we'd probably get something a lot like this:
It was almost something of a relief that Georgia had finally convinced her boyfriend to make an honest woman of her after years of his cold feet about a church wedding. It bothreed Margaret that Phil stalled so long given how well she and Bob got along with most of the Richards family. The only person she didn't know especially well was Phil's sister, Elly Patterson. This is because Georgia never managed to be able to arrange a sit-down with this person because, well, the woman seemed to hate to travel. It was if she were living in some sort of television programme in which everyone had to go to her house.
This illusion that she was the focal character of a domestic situation comedy seemed to be why this 'Elly' person did something that everyone else called bad form: hijacking the wedding planning because Georgia planned on holding it in the pokey little suburb the presumptuous blusterer of a dentist's wife thought of as Xanadu. It almost seemed that she was trying to force Georgia to elope because of her mother issues or some such nonsense. As if this were not bad enough, one could never seem to make it stick that Georgia wasn't some friendless orphan girl who dropped out of the sky fully formed at twenty-six years of age. Ah, well. At least she finally understood why Phil was worried about the prospect of marriage. He probably feared living the same chaotic, miserable life his idiot older sister willed on herself out of sheer imbecile negligence.
This, of course, led to a rather sad eventuality that she'd fretted about for years since Georgia's bicycle accident. After four false starts, it became obvious that she wouldn't have grandchildren to fuss over. This was sad enough without Phil thinking it for the best because his inexperience made him see a boorish, fractious drone who brainlessly pitted her children against each other as the high water mark of parenting.
If you've been paying attention, this makes of her a minor antagonist like Fiona Brass because she identifies a problem with the Foobiverse that wears its hair in an unflattering style and thinks it's overweight because it slouches forward as if it has the weight of the world on its shoulders. This is also why Molly was insolent and lived in the darkness: she hated having to deal with the dolt next door.