Earl of Ormonde descent

[S. S.]

Does anyone know the exact relationship between the present 18th Viscount Mountgarret as de facto heir to the late 7th Marquess of Ormonde, from whom he is heir to the Earldom of Ormonde? I tried calculating it but I am getting it rather imprecise, something in the region of 14th cousins or more. 

S.S.

[S. S.]

I tried finicking around with feeding the descent down with AI and I got the answer of 13th cousins four times removed. 

[Paul Theroff]

In the genealogy I have at:

https://www.angelfire.com/realm/gotha/gotha/ormonde.html

the late Marquess is "5m", being twelfth in descent from the 9th Earl of Ormond.

while the 18th Viscount is "1o", being fourteenth in descent from the 1st Viscount, brother of the 9th Earl.

Thus if that genealogy is correct, they are twelfth cousins, twice removed.