Jack Sweeney, his wife Lorraine and their granddaughter Erin McQuade were three of the six people killed when an out-of-control bin lorry crashed in George Square in the city centre, just three days before Christmas.
The funeral service will be held at St Patrick's RC Church in Dumbarton. The Archbishop of Glasgow, Philip Tartaglia, will be leading the requiem mass and a private burial for each family member will be held after the service.
In the days after the lorry crash, hundreds of people have paid their respects to the crash victims, which also claimed the lives of three other civilians.
Over 1,000 people observed a two-minute silent virgil at Glasgow's Royal Exchange Square, in remembrance of the crash victims.
The other victims were primary school teacher Stephenie Tait, 29, from Glasgow, Gillian Ewing, 52, from Edinburgh, and Jacqueline Morton, 51, from Glasgow. At least 10 other people were injured in the incident.
The Archbishop of Glasgow has referred to his experiences with the mourning families.
In a sermon at a service recently, he explained: "I tried to console them and comfort them. We spoke and we cried and we were silent before the abyss of their loss."
The Archbishop described how their circumstances surrounding their deaths had been difficult for the families and that he emphasised the "random" nature of the tragedy.
He said he had felt "privileged to be permitted to spend some time with one of the families who had been cruelly devastated".