An 81-year-old man was sentenced Monday to 37 years to life in prison for fatally stabbing his 11-year-old stepdaughter and trying to kill his wife in their Garden Grove home. Tanh Thien Tran was convicted in April of first-degree murder and attempted murder, with jurors also finding true sentencing enhancements for personal use of a deadly weapon, inflicting great bodily injury and attempted premeditated murder. Tran was convicted of killing 11…