I think you have some misunderstanding about the nature of this trust. I suspect that your father had a revocable living trust, in which case your father would have been the grantor, that trust became irrevocable upon his death and that you are the successor trustee wishing to distribute assets to you and your siblings as beneficiaries of this trust. The fact that you mention distributing anything from this trust seems to imply that this is the case.
You would probably benefit from consulting a trust attorney.
