What does Matthew 8:14 mean?

Peter and his brother Andrew were two of the twelve core disciples of Jesus. They were from Bethsaida (John 1:44) and had worked as fishermen for a living until Jesus called them to follow Him (Matthew 4:18–20). They moved to Capernaum at some point; Jesus lived there, too. Peter was married, and his wife's mother lived with them. It was considered honorable for adult children to care for their aging parents.

Jesus came to Peter's house one day to find Peter's mother-in-law lying down, sick with a fever. In that time, fever was considered a disease and not just a symptom. This incident is also described in Mark 1:29–31 and Luke 4:38–39. Matthew does not always report these moments in chronological order. Instead, he groups similar moments together to fit a specific topic. In this case, he is collecting stories about Jesus' miraculous power. These are meant to support the idea that Jesus is, in fact, the Messiah.