A Ramle Magistrate released the relatives of Dimitry Kirilik - suspected of murdering six members of the Oshrenko family in Rishon Lezion last month - to house arrest on Monday.
The family members were arrested after being suspected of helping Dimitry cover up the crime.
Dimitry and his wife Natalia were ordered to remain in custody for another week, and will face a formal indictment next week.
Meanwhile, Kirilik's attorney, Uri Keinan, filed an appeal at the Tel Aviv District Court against the Israel Prison Service over the conditions of his client's custody.
Kirilik is kept bound to a bed in his cell due to fear that he may try to take his own life or assault prison wardens.