"It's like caring for two very small children, every hour of every day. Everything has to be done for them," Mr Butt said.
The couple have care of them in their home 24/7.
Mr Butt says that his daughter in particular was at risk of death on a daily basis. She often needed medication or distraction in the early morning hours when she suffered seizures.
For providing 24-hour care they receive the minimum wage, $15.75 an hour, for 50 hours a week.
The maximum is 40 hours, but the Butts have been granted an extension because of a lack of caregivers in Kaitaia.
The needs of their children were so great that neither parent had any prospect of finding employment outside their home, but in any event the financial support they received specifically precluded them from other work.
Mrs Butt said families should be recognised as the best caregivers. Her husband had no doubt that were his daughter to be placed in care she would be dead within a month.
Last week the couple asked the Ministry of Health and/or DSS to increase their support to $19-$27 an hour.
"Refusal would be discrimination against family status," Mrs Butt said.
They were unsuccessful.
A spokesman for Disability Support Services noting that Funded Family Care was not included in last week's pay equity settlement. There were no plans to change current funded family care entitlements or payments.
Individualised funding could not be used to employ or contract support workers who were the spouse/partner or parents of the disabled person, or family members who lived in the same house as the disabled person (family member being defined as a grandparent, grandchild, daughter, son, sister, brother, aunt or uncle).
Mrs Butt has now laid a complaint against the Ministry of Health with the Ministry of Business, Innovation and Employment, accusing it of discrimination.
"The families of disabled people who look after their loved ones have been forgotten again.
"The Minister is saying families are not doing the job properly, so they are not recognised. That's the way we see it," she said.
The couple had also complained to the Human Rights Commission, without success.
"We get the feeling they don't want to do anything about it because they are looking after the government's interest," Mrs Butt said.