Well .. I found a way in for you i think. However he will know you were in as it will reset the password to one you choose. This is provided he is using a mac book pro. Do you know the exact mac your hubby has? Maybe i can find more for you.
https://discussions.apple.com/thread/3976448?start=0&tstart=0Maybe that will help you.
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Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
When the menu bar appears select Terminal from the Utilities menu. Enter reset password at the prompt and press RETURN. Follow instructions in the dialog window that will appear.
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MNG
edit to add the instructions from the link.