The lock screen is a security measure with a specific purpose, to prevent access to the user's account on that phone. If it was easy to just bypass, that would make it more or less worthless. So don't get your hopes up that those photos and videos will be recoverable. While there are plenty of claims that there are utilities available to just restore such things, don't be surprised when marketing babble is different than reality.
Are you sure that you or your husband cannot dip back into old memories and recall just what PIN was used on that phone?
As a side note, be sure to set up some kind of comprehensive, automatic back up solution on your current phone(s) if you haven't done so already. Don't be stuck in a similar situation down the road, be sure your data is backed up and obtainable if necessary. Really, backups are important.