i think you'll find you read the info wrongly. it says if you're a member of a couple. not payment per person within a couple

in any case, it doesn't apply here - PB's child requires additional care that she is able to provide. her DH is able to go to work - it doesn't take two people full time to care for his issues. the criteria are pretty black and white - you have to be taking care of your child for significant additional time than a child without a disability would require you to care for them...