Elden Ring: Shadow of the Erdtree makes the already convoluted family tree of the gods and demigods even more confusing with the addition of Messmer, and the confirmation that Melina is also among Marika’s children. However, the only pieces of information that are concrete are that Messmer and Melina are Marika’s children, but the amount of missing details means that it’s difficult to place their births in the game’s timeline. As such, players have been analyzing the available information and the aesthetics of each character to find answers to the questions raised by the DLC.
https://screenrant.com/elden-ring-shadow-erdtree-messmer-family-father/