The theft of the four wheels and wheel nuts on Saturday morning from their white Honda Accord, parked in the drive of their Alexandra home, was more bad luck, she said.
The couple welcomed their first child, Riley, in February and he was diagnosed with Zellweger Syndrome, a genetic condition so rare, it only affects one in every 50,000 or 100,000 babies. There is no treatment or cure and babies with the condition rarely survive beyond the first year.
"We really rely on our car, to rush Riley to [Dunstan] Hospital if he has a stop-breathing episode. It's quicker for us to drive there than wait for an ambulance," Mrs Brown said yesterday.
"To think that anyone would come along and steal the wheels like this, bringing their own blocks of wood to put under the car, so it was obviously planned... How low can they go?"
She went to bed at 4am on Saturday after being up with Riley and heard the neighbour's dog barking 10 minutes later.
"I probably just missed it happening. We think there would have to be more than one person that did it. There's nothing special about the wheels at all, they're just standard, boring wheels, but it's gutting to think something like this would happen in little old Alexandra."
Riley's health issues and frequent admissions to hospital, Dunedin as well as Dunstan, meant the family was struggling financially, Mrs Brown said.
"We worked hard to buy our car and it's insured but we'd have to pay the excess, of course, which is another cost to us."
Riley was admitted to Dunstan Hospital on Sunday and was home last night.
"It was just lucky the car had been sorted again when we needed it urgently on Sunday. Imagine if I'd been home by myself and needed to take Riley to hospital and found the car like that, without wheels."
The theft had been reported to police and staff at the Alexandra branch of Beaurepaires were also advised, in case they were offered the stolen goods.
A staff member at Beaurepaires had loaned the Browns two spare wheels of his own and Hill Automotive also loaned two spare tyres and wheel nuts, which the family was grateful for, she said.
"But what we'd really like is for the people who took the wheels to have a conscience and return them, no questions asked."
• Anyone wanting to offer help or donations can do so via the Givealittle page.
• Anyone with information about the theft can contact Alexandra police or Crimestoppers on 0800 555-111.