Who Said That Sirzechs Only Had One Son?(Discontinued)

Sirzechs Lucifer: the former heir of the Gremory family, the Crimson Satan, the False Lucifer, and husband of Grayfia Lucifuge. Sirzechs has a son named Millicas. But who said he only one kid? Enter Adalgar 'Crimson' Gremory, the first son of Sirzechs and Grayfia, and the first Gremory since Zoeticus to not have the Power of Destruction. Instead, he inherited the power of his mother, and therefore, the power of the original Lucifer. What if he was put into an arranged marriage? What if he was friends with the Phenex heir? What is the reason he never appeared in the main series? (Major bashing of all Gremory's other that Sirzechs, Millicas and Grayfia)