The Krims announced that they are expecting another baby, according to ABC.
"We are very happy to let you know that Marina is expecting a baby in the fall," the family wrote on the Facebook page of the Lulu and Leo Fund, which funds arts education in memory of their children.
In October 2012, Marina came home to find the bodies of her children in the bathtub. Lulu was 6 years old, and Leo was 2.
The Krims have a 4-year-old daughter, Nessie, who was unharmed in the incident.
Their former nanny, Yoselyn Ortega, is accused with having committed the murders. Ortega, 50, has pleaded not guilty and was found mentally fit for trial. Ortega's lawyers disagree, however, and have pushed back the trial date, People reported.
Ortega's next court date is May 21.