It's always been my understanding that standard protocol is to have one or both parents stay in the home so LE has easy instant access to ask questions and get necessary information, and so that someone will be there if the child comes home or calls.
This is from the NCMEC booklet that LE agencies distribute to parents of missing children.
Your Role in the Search: The First 48 Hours
In the initial stage of the search, devote your time to providing information to and answering questions from investigators. Once you discover that your child is missing, you will desperately want to help with the search. You may, in fact, wonder how you possibly can stand by and let others look for your child. But the reality is that in most instances, the best use of your energy is not on the physical search itself. Rather, you need to provide information to and answer questions from investigators and to be at home in the event your child calls or returns. The checklist Gathering Evidence in the First 48 Hours identifies the most crucial pieces of background information and evidence that law enforcement will need in the search for your child.
https://www.ncjrs.gov/pdffiles1/ojjdp/228735.pdf
Also, I've seen parents in news videos who, when they finally do leave the house, are obviously devastated, even to the point of physical collapse, needing people to hold them up. From the cases I've followed, it's not unusual not to even see parents for up to a week after the child goes missing.
Some parents are told by LE to stay in the house, parents have to talk with LE to provide necessary info, and some parents are unable to leave the house. They're busy with LE, and they're devastated.
MR said that he was told by LE to stay in the house. It was something like that he was cooperating with LE, whether that was to wait in the house for Dylan to call or come home.
:twocents: