What's the immigration status of your wife?
Until your wife has ILR there are a number of restrictions in place due to her 'no recouse to public funds' condition.
As for claims made in your name, you are limited to claim only what you would have been eligible to claim for had your wife not been here.
(there are a couple of exceptions such as working Tax Credits and Child Tax Credits).
Are you sure it's Carers Allowance you're receiving ?
Carers allowance is paid to one person only.
More than one person in the same household can claim Carer’s Allowance, but they must be caring for different people.
For example a husband can be caring for his wife and his wife may may be caring for someone else who lives with them. In which case, both the husband and wife can claim Carer’s Allowance.
Or let's say if both parents are caring for two disabled children and both meet the qualifying conditions for Carer’s Allowance, each could claim Carer’s Allowance for caring for one of the disabled children.
If you claim Carer's Allowance, it could affect the amount of benefit the person you care for receives.
I'm not a benefits advisor. You may find this link useful - Benefits Adviser