The Cold Play singer's father Anthony Martin, however, insisted that the couple is one good terms, reported Contactmusic.
"If you are married you know you have good days and bad days. We all have our ups and downs. It is sad because there are our two grandchildren. But it is all very amicable between them," he said.
The singer's 71-year-old grandfather is also sad with the couple's separation but is "very proud" of what they have achieved.
"I am very proud of what they have achieved in their lives," said Martin senior.
They first met at one of Coldplay's concerts back in 2002 and married a year later in a secret Southern California ceremony.