The Prince Is My Kid's Dad?!

Lyra, Marquis Hayden's eldest daughter, decides to raise her son alone. When her grandfather is critically ill, she returns home. Facing her stepmother and stepsister's schemes to marry her off to a sumgbag, she chooses to wed the prince! Unexpectedly, he's willing to accept her son as well! But why are the Emperor and Empress holding her son without her knowing?