Darren Lewis, who had Down’s Syndrome, was also a keen football fan and would watch Wales and Cardiff City play with his nephews.
He supported Arsenal Football Club and “relished every match”, his family said in his eulogy.
They said he loved being part of family occasions and enjoyed being the centre of attention.
“It was Darren’s fighting spirit that drew people to him and made him who he was – the strong, determined character that was loved by so many,” Father Haydn read.
During the funeral, the hymn All Things Bright And Beautiful was played, as well as Sir Cliff Richard’s The Minute You’re Gone.
Queen’s Friends Will Be Friends was played as each coffin was brought out of the church and placed into a hearse.
The family of Mrs Lewis and her sons previously described how Darren and Mrs Lewis, who had chronic obstructive pulmonary disease (COPD) and emphysema, had been shielding.
Dean had only gone out once a week to shop for his parents.
It is not known how they caught Covid-19, along with 10 other members of the family, but it is believed to be through community transmission.
Mrs Lewis developed symptoms of the virus around a week before her death and was admitted to hospital on Oct 25.
Dean Lewis tested positive after his mother was admitted to hospital. He died on October 30.
Darren Lewis was admitted to the Royal Glamorgan Hospital and was later transferred to the intensive care unit, where he died on Nov 2.
The family were unable to be with Darren before his death, due to them testing positive for coronavirus and having to self-isolate.
In the funeral, Father Haydn paid tribute to NHS staff who were working through the pandemic.
Writing in the order of service, the family said: “As a family we cannot express how much your love, messages and support mean to us all.
“We would like to say thank-you to each and every one of you. Special thanks to Father Haydn and to everyone who has supported the family during this difficult time.”
The family also thanked Rob and Alex Thomas Brown, who supplied the sound system to allow for people to listen to the service outside the church.