What is burdened?

While they were talking, Flora walked in with the two children. “Hey! Mommy!” Eliana jumped at Alice and cheered as soon as she saw her, while Max looked exhausted. He strolled inside, and then sat down on the couch and wrapped his arms around Alice as he was about to fall asleep. “Max doesn’t usually work out, does he? We have only been running for a little while! He is a pampered child!” Flora showed an expression. Alice felt resigned. She patted Max’s head softly and explained, “Well, to be honest, it’s not his fault. Max had always been sick when he was a child. He had a fever when he was younger, so he couldn’t talk anymore. He is always in poor health.” Flora put down the teacup in her hand, looked at Max thoughtfully, and asked, “He couldn’t speak because of fever? So, he never spoke?” Alice frowned and replied, “Not really. I heard Zayden say that he has spoken twice in a year.” Flora looked at Alice with slightly more profound meaning and said, “Things may not be that simple.