The mother of Team GB's silver medal-winning brothers said she will not be pleased with them if they are disappointed with their "amazing achievement".
Peter and Richard Chambers and crew-mates Rob Williams and Chris Bartley were pipped to gold in the final of the lightweight four at Eton Dorney when a late surge from the South Africa team clinched a dramatic victory.
The brothers from Northern Ireland were hoping to secure the region's first gold medals for 24 years.
Their mother, Gillian, said silver was a fantastic result.
"I am completely delighted," she said. "That was a ridiculously tough race. It was amazing, I am so proud. I hope they are not disappointed. At that level that achievement is just too fantastic to consider it a disappointment.
"It was an unbelievably tough race. If they are disappointed, I will be disappointed with them. I think they will be very proud of what they have done."
Older brother Richard, 27, was called the wrong name during the medal ceremony, when the stadium announcer introduced him as "Richard Williams".
His mother laughed off the gaffe. "We know who he is, that's all the matters to us," she said.
Raucous GB fans gave the four rowers a deafening reception as they glided past the stands on a lap of honour following the ceremony. The volume levels cranked up even further when they got to their feet and raised their hands in the air as the boat rocked below them.
"I think they just wanted to say thank you," said Mrs Chambers. "The crowd were just so unbelievable and I know they really appreciated that."