Yes...

[ He puts a hand to his forehead like that story was unearthed from him rather than something he casually remembered. ]

... Sucre was my little sister. The Toad King liked how she danced and stole her for his amusement when I refused his offer to let her go. By the time you met her, she was grown up... I was overprotective of her... and she had tasted Enoch's sugar, so all I could do was make her comfortable.