Moreover, Edgar cannot forget his wife. At the same time, Evie and Celica are almost old enough to be his daughters, considering their age.
As for F/F, this is generally determined by the plot. Take a closer look at the game world. This is a medieval town, torn apart by wars - either with the Demon King or with monsters. Mostly women remain in the city. They are gradually replacing men almost everywhere. Including in terms of romance. There is a lot of fan service in the game, but many moments are logical.