The police were very guarded, right from the start, about who else was in the house that day. I think it was the question about how was it known that Becky left the house at 11.15am, that led to the comment, by the police, that there were other people and family members in the house at that time....
I would be interested to know if he, the stepbrother, joined any of the searches. I could see her - the g/f - having the excuse of needing to take care of their daughter, but I wonder if he also made excuses.