This is the tear-jerking moment an East End gran - who suffers from dementia - remembers an old Celtic song she sang as a child, despite forgetting who her granddaughter is.

The 88-year-old - who was celebrating her birthday at the weekend - was captured in a short video clip by granddaughter Natalie who is from Glasgow.

In the clip, Natalie is helping her gran with a touch of makeup on her birthday when she breaks into an old Hoops song about Celtic hero Jimmy McGrory.

With Natalie helping her gran at one point, the song contains the lyrics: “...in the fight for the Cup / When Jimmy McGrory put Celtic one up / We’ve done it before and we’ll do it again / On Erin’s green valley’s look down in thy love.”

McGrory was at the club between 1922 and 1937, after which he went on to manage the team after World War Two.

Captioning the video on Twitter, Natalie said: “Happy birthday to my 88-year-old granny who is suffering dementia. Doesn’t remember who I am but remembers the words to every old @celticfc song.”

In just four says, the clip has received 4,000 reactions as social media users express their joy at the heartwarming moment.

READ MORE: Husband reveals toll of becoming full-time carer for dementia-stricken wife

Natalie told her followers and admirers of the video: “Lunch in a wee pub outside Paradise today.

“Don’t let it fool you. She’s mental - typical East End granny and an old rebel.

“It’s a horrible journey for all involved. Can’t imagine what it’s like to live in a world of strangers and confusion.

“It’s just getting harder to take them now as she’s very distant but her character still shines through at times.

READ MORE: Glasgow could face more challenges to cope with future dementia 'epidemic'

“My granny went to games as a wee girl with her dad and grew up in Stanford Street with Celtic Park round her back. Love the old stories.

“She keeps my wee family going that’s for sure.”

In May, the Evening Times reported how more than 4,500 people are living with dementia in Glasgow.

Over the next 20 years, as life expectancy rises, that number is expected to soar.

The report came on the day the Evening Times launched a 12-month campaign which aims to shine a light on a condition that is devastating families.