Hello. I am not sure if you are still looking for info on this family.
The family history center I use has the parish records for Biasca in their permanent collection. After seeing this post I took a quick look. What I saw contradicted what some others have put on Ancestry as far as the parents of Carlo Vanini b1826. According to the parish records:
A Martino Vanini, son of Martino, married Maria Domenica Delmue on 08 Feb 1770.
One of their sons, Carlo Antonio Vanini born 12 Aug 1779, married Marta daughter of Giovanni Domenico Rossetti on 04 Nov 1816.
Their son, Carlo Antonio Tomasso Vanini born 21 Dec 1826, married Giuseppe daughter of Giuseppe Antonio Delmue on 07 Apr 1850.
Again this was based on the parish records.