King James Version
But they, supposing him to have been in the company, went a day's journey; and they sought him among their kinsfolk and acquaintance.English Standard Version
but supposing him to be in the group they went a day's journey, but then they began to search for him among their relatives and acquaintances,New International Version
Thinking he was in their company, they traveled on for a day. Then they began looking for him among their relatives and friends.