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A high official in the [[Episcopal Church]], Andress held membership with the  St. John's congregation in Minden and served many years on the vestry, as warden, and finance chairman. He was a lector and a deputy to diocesan conventions. For thirteen years, he chaired the Diocesan Finance Committee for the Episcopal Diocese of Western Louisiana. For  eight years, he was the chairman of  diocesan board of trustees. He was a deputy to the General Convention of the Episcopal Church for eight consecutive conventions over a period of twenty-one years.<ref name=obit/>

A high official in the [[Episcopal Church]], Andress held membership with the  St. John's congregation in Minden and served many years on the vestry, as warden, and finance chairman. He was a lector and a deputy to diocesan conventions. For thirteen years, he chaired the Diocesan Finance Committee for the Episcopal Diocese of Western Louisiana. For  eight years, he was the chairman of  diocesan board of trustees. He was a deputy to the General Convention of the Episcopal Church for eight consecutive conventions over a period of twenty-one years.<ref name=obit/>

Andress worked for the establishment of a museum in downtown Minden through his role as president of the Dorcheat Historical  Association. Museum director Schelly Brown Francis said that the facility owes its origin to Andress' influence. By the time of Andress' death, "Thad’s dream is a working, functioning reality. He was committed to having the best small museum possible done during his lifetime," said Francis.<ref name=jagan/>  

Andress worked for the establishment of a museum on Pearl Street in downtown Minden through his role as president of the Dorcheat Historical  Association. Museum director Schelley Brown Francis (born 1959) said that Andress was committed to making "the best small museum possible during his lifetime."<ref name=jagan/>  

With his first wife, the former Sarah Elizabeth "Sally" Tatum (1937-2001), <ref>{{cite web|url=https://old.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=Andress&GSfn=Sally&GSbyrel=all&GSdyrel=all&GSst=20&GScntry=4&GSob=n&GRid=30052890&df=all&

With his first wife, the former Sarah Elizabeth "Sally" Tatum (1937-2001), <ref>{{cite web|url=https://old.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=Andress&GSfn=Sally&GSbyrel=all&GSdyrel=all&GSst=20&GScntry=4&GSob=n&GRid=30052890&df=all&