The relationship between Peeta and Katniss in The Hunger Games can indeed be related to the "mourn" beatitude.

The "mourn" beatitude states, "Blessed are those who mourn, for they will be comforted." This beatitude speaks to the idea that those who grieve or mourn will find solace and comfort.

In relation to Peeta and Katniss, their relationship does evoke elements of mourning. Throughout The Hunger Games series, both characters endure immense pain, loss, and suffering. Peeta, in particular, undergoes significant trauma, including being captured, brainwashed, and transformed into a weapon against Katniss. This upheaval causes both characters to mourn the loss of their previous bond and the innocence they once shared.

Peeta mourns the loss of his identity and struggles to differentiate between reality and the false memories implanted in him. He experiences deep anguish and despair from being manipulated and betrayed. Katniss, on the other hand, mourns the loss of the Peeta she knew and loved, as he becomes a different person due to his painful experiences.

Yet, despite the mourning and despair, there are moments of comfort and solace for both Peeta and Katniss. They find solace in each other's presence, as they understand and support one another in their pain. Through their shared experiences and understanding, they find a sense of comfort and healing. Their relationship serves as a source of strength and hope amidst the darkness and tragedy they face.

Ultimately, the relationship between Peeta and Katniss in The Hunger Games can be seen as an embodiment of the "mourn" beatitude. They experience profound grief and loss but find solace and comfort in their connection with each other. The love they share helps them to navigate through their mourning and ultimately find healing and restoration.