Pat here is the information I have regarding your grandfather. Your great-grandfather was George Tuach 1838-1923. He was married to Bessie Roberts died 1917.
They had 12 children
1 a son no name died at birth 8.11.1886
2 John 22.7.1870
3 Elizabeth(Bessie) 23.9.1871-15.2.1925(my grandmother)
4 George 13.9.1873
5 Mary 20.5.1875
6 Thomas 20.8.1876
7 William 25.10.1877
8 Annie 21.3.1879
9 Donald 15.8.1880
10 Catherine(Kate)10.3.1882
11 James 19.6.1883
12 Sophie 6.9.1885
I dont know which one of these males would have been your grandfather.
ja.forsyth@ntlworld.com