police said a 37-year-old man was in custody tuesday following the deaths of his wife and their two children at their home in suburban detroit .
the victims have been identified as christie fradeneck , her daughter celeste fradeneck and her son timothy fradeneck .
the man was held for questioning and the causes of the deaths have n't been released , a police spokesman has said .
officers discovered the bodies at the home in the eastern suburb after the woman 's sister called police .
police went inside and found the woman and children dead .
the children 's birthdays were less than two weeks away .