What does Mark 1:29 mean?

Yet another used of "immediately" highlights a quick transition to the next scene in Mark's story. So far, the four men mentioned are the only disciples known by name (Mark 1:16–20). Simon Peter and Andrew share a house in Capernaum; Simon Peter is already married (Mark 1:30), but it was not uncommon in their culture for extended family to live together.

Archaeologists have found the ruins of a house in Capernaum that was converted to a meeting place. It's thought that this was the site of Simon Peter and Andrew's home, although there is no conclusive proof. The remains lie under the foundation of a hexagonal church built in the fifth century.

The emphasis, however, in this account is not on the house, but rather on what will take place in this house. What began as a home for two fisherman brothers and their families quickly becomes the center point of a movement. Andrew and Simon Peter couldn't have known what they were getting into when they accepted Jesus' call and invited Him into their home. Soon, they would be swamped with miracle-seekers and then expected to leave their home and spend much of their time traveling. Their days of a peaceful life on the lake are pretty much over.