The Preston-based duo shared the video on their official TikTok account @thespudbrothers for their 3.6 million followers, where they offered the couple the viral food van's last two potatoes free of charge as they walked past.
The staff member appeared concerned and asked if they would like him to call anyone for help, but the man refused and explained she has Alzheimer's and ordered her a potato with the same toppings.
One TikToker took to the comments and said: "I was already upset with the way she was just standing there shyly, then he said she just fell, and she's got Alzheimer and then I'm sobbing and I'm not okay people with Alzheimer break my heart.".
The couple nervously approached the van as they accepted the offer, and the potato vendor shared which toppings were available.
The thoughtful offer came at the perfect time for the couple, who seemed to be rather downcast and sad after revealing the elderly woman had just fallen over.
