Since Chris and Hyla benefitted from draws on your trust accounts, use his Social Security Number, as that is the primary on their tax returns as yours also probably if you are married. I believe several people now have it and may be willing to pm it to you, his address, you can use the old address at calle de arcos as that is the last address the feds have too. The form is self explanitory send a copy to the calle de arcos address and to the feds/