However, his assets have yet to be fully divided up between his family, and may take up to five years to finalise, according to The Sun.
The late Bee Gees singer passed away in May after a long battle with cancer at the age of 62.
His earnings are said to have been divided between his wife Dwina and children Melissa, Spencer and RJ.
Gibb's housekeeper Claire Yang - whom he fathered a child with - is also reported to have been given a £5 million settlement before his death.
A house Gibb had purchased in his hometown of Thame, Oxfordshire for £850,000 has now been placed in her name.
The singer's property collection also includes his £15 million family home, a £2.6 million Miami Beach mansion and another £8 million house in South Kensington.
A friend of the family said: "Probate could take years to sort out. No-one but Claire's received anything so far."
Robin Gibb was honoured with a blue plaque placed outside his former home in Priestend, Thame, to celebrate his life and work.