I go with my husband to help him with his cleaning contracts, can I claim some of the income as my income even though he was paid for it.

It is up to the pair of you to decide how to report this income. He is effectively sub-contracting work to you.

Make sure any income you receive is properly invoiced.

however, he charges gst/qst when he bills the customer, I am not registered, would he have to deduct my part off before sending in his remittances for the sales tax or after?