Having lost her beloved mum, Jennifer, to cancer in December, this was four-year-old Ella Lennon's first Mother's Day without her.
However, thanks to one kind-hearted Royal Mail worker, the day passed a lot less painfully for the grieving youngster.
Ella, from Kilmarnock had posted her mum a heartfelt, homemade card, to show her how much she loves her ahead of Mothering Sunday.
She addressed the envelope with: "To Mummy in heaven, Happy Mother's Day. I love you, Ella x."
To the family's joy and surprise, Ella then received a tear-jerking reply.
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Her aunt, Linda Ross, shared the touching letter on Twitter .
She wrote: "On my sister's 1st heavenly Mother's Day, Ella sent her mummy a card.
"Today a kind stranger from the Royal Mail used their time to reply and make a little girl so happy!
"Her face lit up with the biggest smile. Just shows the amazing people in this world! Can't thank you enough!"
Ella's card had a picture of one of the minions from Despicable Me, along with the caption, "You're one in a minion, Mum".
Two days after posting the card, Ella got a reply, which read:
"To my beautiful Ella. Thank you so much for my very special Mother's Day card.
"You're one in a minion to me and I love you very, very much. Millions and billions and trillions is how much I love you!
"You are growing up to be a very clever and special big girl, and I am so proud of you. And even though I am in heaven, I watch over you every day!
"Lots of love, hugs and kisses, Mummy xxx."
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Ella's dad Dean also posted on social media to express his gratitude: "I would like to thank the kind hearted person at the Royal Mail who sent Ella back a letter from her mummy in heaven.
"Her wee face was lit up x."
The exchange between Ella and the thoughtful person behind the reply has touched the hearts of others.
Even a quick glance at the comments shows a lot of tears have been shed for the little girl who wanted to wish her mum a happy Mother's Day.
