If it is a Trust, and your son is actually working for the Trust, you will use the Trust's EIN on the W-2, and it will be an expense to the Trust.
If you are posting the work being done for the Trust on a schedule C on your tax return, and you use your SSN for the schedule C, your son's W-2 will have your SSN.
Note, if this is the case you should be getting a 1099-NEC from the Trust to fund your Schedule C.
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