They had originally planned to hire a room in the SS Great Britain.
At the same time, her family are not allowed to visit her in her flat so they have had to be creative to be able to see her.
Speaking to Bristol Live before the surprise, Mr Beauchamp – who was born in Bristol but now lives in Maidenhead – said: “I think she will be over the moon, she will be delighted and I think it will come as a surprise to her.
“We had to do something to mark the day in some way and we are going to try to make it a bit special.”
Ms Cleaver, who grew up in the Bedminster area, worked for most of her life at Mardons, the printers in Bristol, where she rose from the shopfloor to being a supervisor until retiring at the age of 60.
She never married nor had any children, her nephew said, and for the past decade she has lived on her own.
He said that she is almost completely blind and deaf, can hardly walk, but is as mentally alert as ever.
Mr Beauchamp said: “She is very independent and always has been – she values her own independence and doesn’t get lonely or bored.
“She enjoys being on her own but it is more difficult now as she has got older, especially now because of coronavirus.
“She has a carer who goes in and gets meals on wheels so she gets a daily delivery of hot food.
“It is worrying for us because we would like to see but we can’t.
“We phone her every day and she is very frightened by the virus.”
The family had planned a big party for her with family and friends on the SS Great Britain but this had to be postponed, the nephew added.
They had booked one of the rooms and were going to have a party for 50 people, as well as a tour and a talk.
“We will still try to do it in the future but when it will be, I don’t know,” he added.
Source: Bristol Post