Pre-2019: Deal with Graham
As Jamie's mother, Kim Tate, was set to prison around 2012, she tasked Graham Foster to look after him. However, when he was in a bad place he hired Andrea, who at the time was working as a barmaid at the pub he frequently visited, to do so for him by getting close to Jamie and report his movements back to him. However, after six months she would stop reporting back to him and they lost all contact, as Andrea had genuinely fallen for Jamie. Jamie remained gleefully unaware of the situation and the pair married and had a daughter, Millie.
2019-present: Arrival in EmmerdaleAndrea and Millie arrived in Emmerdale in early June 2019. She first runs into Jamie's mother, Kim, who is shocked to realise they are Jamie's wife and daughter. Kim remained hostile towards Andrea but reluctantly allowed them to move in with her at Home Farm. Kim eventually finds out about the arrangement between Andrea and Graham and confronts her. Jamie is still blissfully unaware of the arrangement and despite Kim’s belief that Andrea is after Jamie’s money, Andrea insists that the wealth is of no interest to her, she loves him. However, Andra realises she has to be honest to Jamie and 12th June, informed a stunned Jamie how Graham paid her to keep an eye on him whilst Kim was in prison. Andrea begs Jamie not to let this ruin what they've got but Jamie feels like they've been living a lie. Jamie insists Andrea should've told him about it a long time ago but Andrea states she didn't want to ruin what they had and assures him she loves him and vows to win back his trust.
Graham attempts to bribe Andrea to leave Jamie but instead, she shows Jamie the money and later Kim attempts to make Andrea leave by suggesting there is something between Jamie and his college, Rhona Goskirk. However, she talks to Jamie and when Andrea comments this place is bad for them, Jamie insists it's Kim that's bad so they'll need to deal with her once and for all. Andrea and Jamie created an elaborate plan and roped in Rhona to gain Kim's shares in the veterinary practise. She initially falls for it, but realises what the two are up to via a call by Millie where they confess the whole thing, unaware Kim is hearing the conversation. However, Kim agreed to give Jamie her share in the practice in order to keep him in the village and eventually became more civil towards Andrea in means to make him happy.
In late August 2019, Andrea and Jamie 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, when Kim offers to babysit Millie so Jamie and Andrea can look at another school, she secretly arranges a meeting with the school's headmaster. Jamie and Andrea are upset that she went behind their back but Andrea soon realises it is a good opportunity and as they don't have many other options they should take it. However, Jamie is insistent that Millie shouldn't have the type of childhood he had, but Andrea manages to convince him that he shouldn't let his own bad experiences come between Millie getting a good education and they agree to Kim's offer.
"Sorry?" - first line, to Kim Tate.
"Come on Jamie, you're the best stripper around." - to Jamie Tate.