The wife of ex -president Hosni Mubarak - Suzanne was taken into custody in Egypt.
She is suspected of illegal enrichment and involvement in corruption.
The 82-year-old Mubarak itself is in a hospital in the city of Sharm-Ash-Sheikh. He was interrogated several times.
Criminal cases have been instituted against two sons of the four Mubaraks.
Hosni Mubarak was forced to resign in February this year - after mass performances demanding his departure.