The penalties for screwing up NFA paperwork can be pretty severe and range from federal felony and prison time to substantial fines and loss of your NFA item. Add on top of that unique situation like yours (living with a convicted felon) and I've got to question just how much money you are saving by using Quicken Willmaker to do a trust.
Likely, you can find an attorney who can help you set up a nice, legal NFA trust as well as answer these questions for you. Form legal documents are great as long as you understand what they do; but legal documents have consequences and responsibilities with them - if all you understand about Quicken Willmaker is that it lets you own a suppressor, you will probably be OK; but what about the other parts of that document and what they mean for you?
To give one example, a person cannot be a trustee, grantor and beneficiary of a trust. In many states, being all three of these will invalidate the trust. If you have created an invalid form trust, what happens when the ATF discovers that the entity that holds an NFA item can't legally exist? If you appoint someone else to the trust, what role will they serve? Typically since you create the trust and put the NFA item in it, you will always be the Grantor. That means the third party must be either the trustee (the person who controls and manages the item for the sake of the beneficiary) or the beneficiary (the person who receives the item when the trust expires). A trustee has a legal duty to manage the trust assets for the beneficiary. If you burn up the blast baffle in your suppressor by doing a lot of rapid-fire mag dumps, have you created a legal cause of action for your beneficiary to sue you?
A few hundred dollars for a lawyer may sound expensive up front; but start pricing out lawyers AFTER you have been served/arrested and I guarantee you that it won't seem near as bad by comparison.