on...Sometimes I think it has more to do with the police being lazy..and hoping the "significant other" will be the real killer so they won't have to work very hard.
The child could have been at a sleepover....that happens a lot with close family friends...girl children especially like to have those and their moms tend to encourage it.My daughter has been to a couple of those, although none recently.
Of course you look at the husband but you don't want to have tunnelvision. You look at burglaries in the area.You look at drug problems in the area.Junkies often will perform burglaries to support their habits.So is anything missing from the home? Has her ATM or bank card been used? Did she carry around alot of cash with her ? Stuff like that.
You also look to see if any recent work has been done at the home.Any home improvements where some workers might have come there and been inside the home.
We'll see if the husband has an alibi.I hope he does..I hope he didn't do it .That will make the case much more interesting.