Suchdev said a group of family had arrived to be with the couple, joining New Zealand-based family and friends.
"They are feeling so low that they are hardly talking," he said. "It was a really unexpected thing, it's making their lives terrible. They are just so frustrated and low in morale."
The Bhartiya Samaj Charitable Trust was doing what it could to help, Suchdev said, forming a support network for the injured couple.
"We are fortunate that we have been able to do that for them. To offer help is a good thing. It's the New Zealand way," he said. "We really commend NZ hospitals for the job they are doing."
The Singhs, who are of Indian origin, are two of nine Americans believe to have been caught up in the disaster.
Newlyweds Matt and Lauren Urey were on the cruise for their honeymoon, and had gone to White Island for a hike, and remain in hospital.
According to relatives, Matt had suffered burns to about 80 per cent of his body and Lauren to about 25 per cent of her body. Both needed surgery.
Ivy Kohn Reed, from Massachusetts, and Rick Reed were both rescued from the island and are also recovering in hospital.
Surgeons have worked around the clock caring for the 28 people who remain in hospitals across Australasia, an update from health officials said today.
Of those, 15 patients are being cared for at four hospitals across New Zealand - 11 of them are critical.
Eight are being treated at Middlemore, three at Waikato, two at Hutt Valley and two at Christchurch.
Another 13 patients have been transferred to Australia.
Three patients have died. Three were released. In total, 16 people have died after the eruption.