“I realized that I left the back gate open and I panicked and came inside the house, searched the house, me and my wife,”
Why would you go back inside the house after realizing you left the gate open OUTSIDE? Surely the first place you go and look is outside of the gate, if they are in the house they will be fine.
According to TW, he did search the back yard first.
Beginning at the :28 mark in the video below.
TW: It was cold. I was gonna make a fire. So, there's a lot of wood in this area right here next to our house. I opened up the back gate, I'm throwin' wood, bringing it inside the house, my wife's inside - she was actually wrapping gifts so we thought it was a good idea that they, that our youngest two go outside and play with chalk on the back patio.
Do not let them go on the dirt in the back yard, keep them close. They was playin with chalk and I came in the house, I saw them there and I went in the house, I came back out, I didn't see 'em now. I immediately went back in, asked my wife, "Did you see the boys?" She said, "No, they should be outside playin with chalk." I said, "Well, I didn't see 'em."
So, I came back outside and I started searching my backyard. I searched the whole thing.
I realized that I left the gate open and I panicked, came inside the house, searched the house, me and my wife. Once that, that didn't pan out, I got in the van, I looked down the street both directions. it was getting dark, getting cold, and I hit a bunch of corners. I went down this street, I turned my light on, I searched, I searched, I called they names.