A mother, father and their two young children were found shot dead in an apparent murder-suicide, according to police in Texas.  A babysitter called police Monday evening and requested a welfare check after not hearing from the family at their Houston home, and all four — including kids a 4-year-old and 8-year-old — were found dead inside, according to the Houston Chronicle. It was not immediately clear who was behind the killings, but police have said it appears to be a murder-suicide. None of the victims has been identified as police continue to investigate what happened. A neighbor said the…