Additionally, if they left the house at 5 as they normally did, common sense says that Tina would have taken her purse with her. I have read the comments that maybe she had several purses, or maybe she chose to go to work without her purse, but it has been reported that she left her purse at home - which presumably means the purse that contains all the things she normally needs on a daily basis. I'm assuming that it has been reported because it is out of character for her to be gone, and her purse to be at home.
The cell phones are missing, and I suspect that they stopped pinging when they were at home.
That leaves two options - help me out if I'm missing something: a home invasion where the children did not wake up, or someone with normal access to the home is responsible.