There is a lot at stake at Wembley with opponents Manchester City, recently crowned WSL champions, chasing a domestic Double.
Brighton, meanwhile, are looking to scale new heights having continually raised investment in its women's team for several years.
In 2021, the women's team moved into training facilities at the American Express Elite Football Performance Centre thanks to an £8.5m investment.
Last month, they released plans for [Europe's first purpose-built women's football stadium,](/sport/football/articles/ce8p01x34pyo) at a cost of £75-80m.
On the pitch, top talent has arrived, including England's Euro 2022 winner Fran Kirby, Nigeria keeper Chiamaka Nnadozie and Japan striker Kiko Seike.
It is the right trajectory for success and Kirby hoped their performance in the FA Cup final will honour Rado's part in their growth.
"I'm pretty sure there will be no-one else prouder than Rado of Dario for getting there. We really wanted to honour him and the work that he did here," said the 32-year-old forward, who won the FA Cup five times at former club Chelsea.
"It left a massive mark on the team, and to get to Wembley, with everything that's been going on, is credit to the coaching staff to push their emotions aside."
USA striker Madison Haley, who scored in their [dramatic 3-2 win over Liverpool](/sport/football/live/cewp5r0080pt) in the semi-finals, believes Rado will be on their minds on Sunday.
Asked what victory would mean to the Vidosic family, she told BBC Sport: "It would be really, really special but Dario's not one to make it about himself.
"It's not something he would probably say to the group but it's definitely been on our minds. We all want to make Rado proud.
"I think he would want us to give absolutely everything and get it done. Hopefully we can continue to make the whole family proud."