His wife teared up when this topic was raised, and turned away to compose herself.
The first-time parents' heartbreak was compounded because, they said, doctors were not keen to take up Theresa's case, and she was transferred from one hospital to another.
The family finally found a neurosurgeon who operated on the baby when she was four months old, closing the opening in her back, which had not fused as normal. However, defining the full extent of her medical condition was slow and - literally and metaphorically - extremely painful.
When she was about four, she was asleep in her cot in the living room when both parents heard a loud snapping sound. They realised that she had broken her thigh bone after her leg became caught between the railings of her cot.
By the time Theresa was seven, she had already endured 10 orthopaedic operations, some to correct the alignment of both club feet as well as to alleviate webbed fingers.
"Every bout of surgery she had was difficult for her, and for us. It was difficult for her to get used to injections," recalled Bernard at the Windsor Barra Hotel in Rio de Janeiro during the Paralympics.
Defining the course of their daughter's life was, in no small measure, her indomitable will. Despite being paralysed from the waist down and suffering from urinary and bowel dysfunction, she placed no limitations on her physical boundaries and - crucially - her parents supported her all the way.
When she was nine and wearing leg braces, Theresa asked her parents for permission to climb up a playground structure about three metres high. They did not have the heart to say no, but watched her like a hawk as she made her way up on her own, fuelled by raw courage.
"It is this freedom we gave her," said Bernard, "that boosted her confidence over the years."
The family grew, with the arrival of a sister and brother for Theresa. And despite frequent hospital trips for their eldest child, the parents made sure she was not spared punishment when she misbehaved.
"We tried not to differentiate between the three of them (in our parenting style). We helped her, but did not give in to her just because of her disability," Rose said firmly.