I'm trying to connect my William Alexander Boyack b 1873 IA, married Elizabeth Booth to William Boyack who married Katherine Moody.

The only info I have so far is:

Wm Boyack b circa 1796 m Jane Anderson both born Scotland
Alexander Boyack b 1827 d 1908 n /sarah unknown Scotland
William Alexander Boyack b 1873 d 1945 m Elizabeth Booth
Beatrice Booth Boyack m Dr. John Harrison Robinson

Can anyone tell me who the siblings of my William Boyack are?
All leads appreciated. Thanks, Sey