Filing

In TurboTax Online, it will add the disability tax credit transferred from a dependant to whichever spouse it thinks is the best option. There is no way to change who's getting the transfer if you are doing a joint return. 

Unfortunately, the spouse that's chosen is not always the person that is listed on the DTC form. So you would either need to change who's on the DTC form, or adjust your return (using MyAccount or T1-ADJ T1) to add the transfer to your return, and then remove the transfer entirely in TurboTax so that your Husband can file.