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Q: Did Alvis know that [Deidre] was his half-sister?
A: Not in the beginning. Within the palace, there were few people who could tell him about Prince Kurth and [Sigyn's] relationship, and he was only 7 years old when his father committed suicide, so he would likely have been uninterested in the palace gossip that was occurring during that time. Afterwards, his beloved mother [Sigyn] disappeared, but because of his powerful trust in his mother he wasn’t disturbed by the rumours. Alvis always held the belief that his mother would return for him. He became the ruler of the Velthomer family in his youth and his influence frightened the nobles. Often he would quarrel with them after they disrespected his mother (even though they spoke the truth) and in extreme cases, he even killed people.
Although he had no interest at all in girls, when he first saw [Deirdre] he fell in love at first sight, which may have been influenced by his mother complex. After marrying [Deirdre], he noticed that [Deirdre] often seemed to be another person, and was afraid that one day she would leave his side like his mother did. Gripped by this thought, he lived his days with great unease (so we can see how much he loved [Deirdre]…) and heard rumours that “Sigurd’s wife had gone missing”, leading him to carefully watch Sigurd. So during Chapter 5, he progressed with his plan (to let [Deidre] meet Sigurd), which was caused by his inability to let go his endless worry. He obviously shouldn’t have checked, but he was unable to control himself; that was the extent of Alvis’s sorrow. Following that, he investigated [Deidre's] past, traveling to the Spirit Forest, and found out that she was [Sigyn's] daughter.
However, after discovering his wife was in fact his sister, his feelings still hadn’t changed. He simply tried his best to not let [Deirdre] find out the truth.