Robin Gibb's widow, Dwina, has spoken of her sadness at him not being there to share the birth of their second grandchild.
Their son, Robin-John and his wife, Megan, announced the arrival of their second baby, a little boy named Theodore-Alexander Hugh Gibb.
In a statement to the Press Association, Mrs Gibb said: "Even though it is a joyful occasion, it is sad that Robin is not here with me to share in the happiness of seeing our grandchildren flourish and grow. I am glad they will have the music."
Robin-John Gibb said: "I know that my father would have been a wonderful grandparent because he was such a loving, attentive and inspirational father.
"We miss him terribly and it is sad to know that had he lived just a little longer, he would have met his two grandsons: Maxwell and Theodore.
"Although they will never meet him, it is great that they will always hear his voice."
The former Bee Gees singer died in 2012 after a long battle with cancer.