My wife runs a small business (less than 10k income) and requires childcare. She uses neighborhood kids so does not get receipts. How/Where can we claim this expense?

In order to be able to claim these childcare expenses, you would have to issue a receipt of care to the person taking care of your child while keeping copies for yourself. 

The CRA may come back and want proof of care expenses. If you can't prove it, you can't claim it!