Apparently, Matt Haig has written a follow up to The Midnight Library where Nora Seed discovers she has an unknown uncle. He was once a Tory MP, and known as Con Seed, but is now a maths professor. He is married to Xenia.
Pro Seed and X Seed have four daughters: Preciosa (known as Pre Seed) is the eldest, Lynne Seed and Poppy Seed run a health food shop, and the youngest is Pip.