Neither Eugenia's mother or father where particularly well off or very close to one another when Eugenia's mother discovered that she was pregnant. They moved in together because it seemed like what they should do and it lasted for about three years before the yelling started. A year later, Eugenia's father had moved in with a new girlfriend and Eugenia's maternal grandmother did most of the care-taking while her mother worked.
Eugenia and her mother lived with Eugenia's grandmother who had a small greenhouse (nothing particularly dangerous and mostly a hobby) where Eugenia used to spend time with her grandmother as she tended to her plants and told Eugenia all about Europe and the fairies that lived there. Her grandmother was also the one that took care of the homeschooling for Eugenia and a couple of other children who lived near.
Eugenia's mother meanwhile worked a lot and when she didn't, she was often out and about, staying with friends or getting home late. Her grandmother became more like a mother to Eugenia which her mother didn't take kindly to which frequently resulted in arguments between her grandmother and her mother as well as Eugenia and her mother when she grew older.
When she started Tally, her grandmother was the only one Eugenia really missed and wrote to and she really looked forward to coming home for break to see her again. However her grandmother got very ill and was eventually moved to a hospice that didn't allow for many visits and so their communications ended up being mainly by letters with a few visits to the hospice here and there. Not really wanting to see her mother, Eugenia eventually began spending her breaks at school when she could.
Sometime during her fourth year, Eugenia's mother left, sending only one letter to Eugenia's grandmother and father before leaving. Once her fourth year was over, Eugenia moved in with her father and his family, which was more than a little awkward as he'd gotten married, had children and gotten a lot more financially stable than he'd been when she was little.
Although she now had somewhere to return to during her breaks, she originally planned on staying at school, but her father bribed her by being willing to take her to her grandmother as frequently as she wanted if she came home instead.
During the break between her fifth and sixth year her grandmother had a stroke and passed away and it shook Eugenia's world and she returned to school pretty shaken and quite different from how she had been before. A little bit more of a recluse and a lot more focused on her work, she seems to be pulling into herself more and more.