Hello Janetto,
Good to hear from you, as I think that you may have something there. I do have a pretty good tree of the Williams's and would love to share it with you. Yes there are many siblings, through several generations to present.
My Robert Williams, was Bapt. 27 Jun 1813 and Died 23 Jun 1875 at Llanrhos Caernarvonshire, Gravestone indicates late of Liverpool, he had a daughter, Margaret who lived at Ty'n Rhewl the family farm.
If you would like to see that family branch tell me how I could send it to you and I'll do my bests.
Kindest regard, Robert Williams