Darren Donaghey, 33, rarely buys a Lottery ticket but bought the £5 scratchcard on a whim on Tuesday when he was in a local shop to get milk.
He and his wife Kate, 28, plan to spend the cash on a larger house for their two children who have autism.
The couple hit the headlines in 2014 when they won a honeymoon as part of a Metro Radio competition in which listeners voted for couples who were most mis-matched in looks.
The Donagheys have a girl aged three and a boy of six, both of whom are “non-verbal”, they said.
The scratchcard win means the family will be able to leave their two-bedroom house in the Walker area of Newcastle and move to a bigger property where each of their children will have a room of their own.
They will also have a sensory room in their new home with bubble lamps to provide a quiet area.
At first Kate did not believe Daren when he came bursting into the house saying he had won £1m.
Once the win was confirmed and they realised what a difference it will make they could not help crying for joy.
Mr Donaghey, who works as a call centre supervisor, is considering giving up his job so he can spend more time with his family and help stay-at-home-mother Kate with the children.
They also plan to use some of the cash to support autism charities that have helped them.
Mr Donaghey said: “We are currently in a two-bedroom house and desperately need more room for the children – now all of our dreams have come true with this win.
“We can move to a new home, which is bigger and with more bedrooms and even create a sensory room for our daughter and son.