You need to do allocation on where they lived when they got whatever income there is. https://proconnect.intuit.com/support/en-us/help-article/form-1040/allocate-amounts-multi-state-indi... should help. 

You will likely use Ctrl + E to open a 2 line detail with a CA income and NY income that totals the federal income. I would assume any gain on the CA house would stay in CA because they were living there at the time of the sale. You need confirm all of the details to do the allocation.