The defense is back to calling witnesses in the trial of the mother accused of murdering her three children in Massachusetts. 

Lawyers for Lindsay Clancy started calling her family members to the stand after the prosecution rested its case on Monday. 

Clancy's mother and sister testified about what they called Lindsay's unsettling behavior before she killed her kids in 2023. 

Clancy has admitted to the killings and is pleading not guilty to first-degree murder on the grounds that postpartum psychosis made her not criminally responsible.