Millie and Andrea arrived at Emmerdale in June 2019, and soon run into and Jamie's mother, Kim Tate, who gave Andrea a safety lesson after her horse was spooked by Andrea's car. Kim was shocked to learn Andrea and Millie were Jamie's wife and child and reluctantly allowed the family to stay with her at Home Farm. It was later discovered that Graham Foster had paid Andrea several years earlier to keep an eye on Jamie, whilst Kim was serving six years in prison.
In contrast to Andrea and Jamie, Millie liked Kim and grew fond of her, often calling her "granny". In July, Millie accidentally uncovered Andrea and Jamie's plan to get Kim to sign her shares in the veterinary practice over when she video called her whilst playing with Jamie's phone, causing her to overhear their conversation.
In late August 2019, Jamie and Andrea worry as they have been unable to obtain a place for Millie at Connelton Primary School and no other school is as close. Kim then suggests Millie could go to Baswick Green Prep School but Jamie makes it clear that he doesn't want his daughter to attend a private school. However, the following day, Kim offers to babysit Millie so Jamie and Andrea can look at another school but secretly arranges a meeting with the school's headmaster, Eustace Briggs. Later, when Jamie returns to Home Farm to find Kim having a meeting with Mr Briggs he is furious. Despite this Andrea convinces him that it's a good offer and that he shouldn't let his own bad experiences come between Millie getting a good education.