Trustee refusing to supply copy of full trust and will

Hello,
Trustee refusing to supply copy of full trust and will

My father recently passed away in Indiana and I have 4 half-siblings (all from another marriage). He had a living trust which he reportedly 'amended'. I am told that he did not have a will. One of my half-sisters (also in Indiana) was named trustee and I am named as one of the beneficiaries.

Acting in accord with another beneficiary I requested a copy of the full trust and will (in case there is one), but the trustee is refusing.

Could you please let me know if I have any recourse.

Thank you for you help.........................blb