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Adam Seaton's dad has written a heartbreaking open letter to his son, as the 20-year-old has been missing for three weeks.

Adam was last seen at his home on Melrose Avenue on Thursday, August 9.

No contact was made by Adam, who works at the Morrisons superstore in Southport , after a text message conversation with a friend at 6.10pm on the day he vanished.

Extensive searches have taken place around Southport, including the area around the RSPB car park on Marine Drive, where a car used by Adam and his family was found.

(Image: Merseyside Police)

When last seen, Adam, who is 6ft 2in tall, of slim build with brown hair and brown eyes, was wearing a burgundy tracksuit top, black and white T-shirt, blue jeans and burgundy Puma trainers.

Today his father Andy shared an open letter to his son with the ECHO.

It reads: "Hi Adz, Life is on hold at the moment, waiting for you to come home. We’re all missing you so much - even the cat. She’s “your” cat, as you know, and feeding and looking after her is hard as I’ve always reminded you that’s your job!

"That’s just one small example of what we’re missing just now - having you around the house, emptying the fridge of food as quickly as we can fill it, playing on your XBOX (“How long have you been on that thing today?!”) or laughing at your favourite TV programmes.

"Liverpool and Leeds are both top of their leagues right now. I don’t think we’ve ever been able to say that before, and for once you can’t wind me up about how bad Leeds are.

"Liverpool have also had the Champions League draw, and your mates will be looking forward to watching the games with you. PSG are up first, 18th September.

"They cancelled the Moto GP at Silverstone last week because of rain. It reminds me of the time we went and stood on Club Corner, huddled together under my umbrella, watching the race as it poured down on us.

"We learned our lesson and bought tickets for the stands the following year! And we’ll do that again the next time we go. But you’ll need to come home first, then we can book the tickets together."

Adam's family have also launched a Facebook group to keep people aware of the case's progress - called Adam Missing Marshside/Southport, with over 5,000 members.