Hi again many thanks for your help, this is what i have found. I shall call them William 1,2,3 etc so as not to confuse further.
1. William Rossiter B 1750 D 1847 M Elizabeth Venn in 1781 Wedmore Somerset. They had 7 children 2 of whom were named William.
2. William Venn B 1781 D 1782 they then had another boy and they also named him William.
3. William B 1787 D 1871.
Elizabeth Venn D 1805 i think in childbirth (Ann last child). William (1) then married Mary Lyons in 1805 i think they had 2 children.
William (3) M Anne Wickham in 1809 in Mere, Wiltshire, palletts marriage shows William (3) was of parish Monkton Deverell. They had 7 children one of whom was Charles B 1823 D 1904 in Warracknabeal, Vic,Australia, Charles emigrated to Australia on assisted passaged, Louisa died in 1858 in Victoria of dysentry. Charles M Ann Fletcher in 1862 and they had 10 children Charles had 13 children altogether. One of Charles and Louisa,s children was Thomas B 1847 D 1903 in Warracknabeal, Victoria. Thomas M Rebecca White (B1848 D 1932) at the Manse Ararat, Victoria, they had 5 children one of whom was Mary Ann (my grandmother) B 1877 D 1964 she married William John Daniel in 1897 they had 9 children one of whom was my mother - who was also a twin. This is a basic history i have for the Rossiters. As i am not from England i don,t know where these places, Wedmore, Meare,Mere,Monkton Deverell, Somerset and Wiltshire are ?? are they close together, did families travel far back in those times or stayed closer to where they were born, maybe someone can put up a map and highlight these places so i can place where they are in relation to each other. There are other family trees out there which show William (3) married to Ann Reeves who also lived and married in Wedmore at the same time, but the children don,t match up with the ones i have, and this is where is becomes confusing.
Cheers June