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Hello again. There are two ways to transfer your photos. Both involve doing a complete backup of the iphone6 and then restoring it onto the iphone7. You can either use the iCloud or iTunes. Those are the two methods.
You may get some of your husband's data, but you can deal with that after the transfer.
What was the problem with iTunes? Are you sure that you let the backup and restore processes run to completion? We need to understand what went wrong, because the two methods are quite similar and the same problem may happen again if we do not deal with it.