Hamas leader Khalil al Hayya said on Tuesday that the family would be among four bodies to be handed over.
The bodies of an Israeli mother and her two children are among four set to be handed over by Hamas on Thursday.
Shiri Bibas and her two children - four-year-old Ariel and nine-month-old Kfir - were kidnapped separately from her husband Yarden Bibas during the October 2023 terror attack.
Meanwhile six living hostages, the final due to be freed under the first phase of the Gaza truce deal, will also be released on Saturday, according to Hamas.
They were abducted at Kibbutz Nir Oz, one of a number of communities overrun by Hamas terrorists on the day of the surprise attack.