User blog comment:Skeith9/Heroic Spirits Speculation/@comment-25951993-20160409160031/@comment-25951993-20160429090746

Don't you get it, Artoria finds giving birth to a child using magic as a failure, so instead she decides to adopt other kids to be heirs, which causes Mordred to get not only more unstable and jealous but also, feel more alienated and think that the king is replacing her with other people's children unrelated to their family.