My in-laws put their $1.4M property in a trust. My sister-in-law is trustee, but blocks our calls.

Dear Quentin,

Nearly 10 years ago, my in-laws put their co-op in a trust, making their youngest child, a widow, the trustee and the power of attorney. No copies of the trust were given to my husband and his brother, the other two beneficiaries. 

My father-in-law passed away three years ago and my mother-in-law, who at first was in…