Declan Donnelly's brother, Father Dermott Donnelly, is said to be 'extremely unwell' in hospital.
Prayers are being held for him and the Catholic community have been sending him well wishes after he was admitted to the hospital.
Pontop Partnership, a partnership of ten Catholic parishes in the Diocese of Hexham and Newcastle, took to Facebook to release a statement on the sad news.
As reported by Chronicle Live, they posted: "Please pray for Fr. Dermott Donnelly who is seriously ill in hospital."
Mirror have contacted Declan's representatives for comment.
St Joseph's Church, in Stanley, will be holding a community prayer on Friday evening in order to pray for his welfare.
Stanley, Dipton & Byermoor Catholic Parishes posted more information on Facebook last night: "Please pray for Father Dermott who is extremely unwell in hospital.
"Tomorrow evening between 6pm-7pm there will be period of time before the Blessed Sacrament so that we can come together as a community in St Joseph's Church to pray for Father Dermott's welfare.
"Please be respectful to Father Dermott and his family at this difficult time, we will update you as and when we receive the most up to date information verified by the Diocese."
Dec's brother, who is eight years older than the presenter, was the one who conducted his wedding to Ali Astall in August 2015.
The TV presenter and his wife had been in a relationship for over a year before they tied the knot.
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Dec is one of seven children, and was raised on Newcastle's Cruddas Park estate with three brothers - Martin, Eamonn and Dermott - and three sisters - Camelia, Patricia and Moira.
Father Dermott took Holy Orders in 1992 in the same cathedral he officiated at his brother's wedding.
He started out as a curate in Chester-le-Street until, a couple of years later, he was asked by the Bishop of Hexham and Newcastle to set up a youth outreach programme aimed at introducing disadvantaged youngsters to the Catholic Church.
He even transformed the Youth Ministry Team, and in 2010, with the help of none other than his brother and Dec's pal Ant McPartlin, he launched the Global Youth Village Centre.
"I don’t advertise that I’m Dec’s brother, but the kids always seem to know. It bridges the gap between me and them," Dermott previously said.
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