There may be errors in this tree's data.Everything is subject to verification,not all  information has been proven.I update as I find more information.

Angus and Calum MacSween came from Caolas Stockinish to Scalpay in 1842.Calum was  allocated tenancy of what is now crofts 27 and 28.Angus had tenancy of what is now  29 and 30. 
 Crofts were halved in 1846/47 Calum kept the village end of his croft becoming the  new 27. 
 Angus the outend half of his croft becoming the new 30.
 Calum was drowned in 1846 when boat foundered on way home from East Coast fishing.  Alasdair na Bantraich was allocated a croft in Maraig,swapped with Malcolm MacDonald (Calum an Eifeataich)who had No 26 Scalpay.
 Tenancy of croft 27 is now held by Calum Macsween a great great grandson of original  Calum MacSween.
 Angus and Calum's sister Catherine married Roderick MacKay and settled in Molinginish, ancestors are in,Rhenigidale Portnalong and various other places

Calum MacSween wife was Margaret ms MacLeod known as A Bainntrach after his death. Margaret was a daughter of Angus  and Anne MacLeod they lived in various locations in Harris.  Margaret's brothers Murdo, William, and Calum moved from Lingerbay with their father Angus to Croft 1, Scalpay in 1843.  When crofts were halved in 1848 Murdo was given tenancy of No 1 and brother Calum No 2. William (Domhnall Buidsear was  a grandson) moved to Maraig with family in 1887.

John MacDermid [Iain Ban na Foalinn} came from Rodil to Scalpay as a Free Church  Catechist/Laypreacher. He was given Tenancy of Croft 24. John's son Angus moved to Maraig in  1880's, MacDonalds Scaladale, MacKays Tarbert are direct descendants There are also  descendants in Portnalong in Skye.
 As far as can be ascertained there is only two  left in the male line of this family with the  Macdermid surname.

Donald MacLennan came from Taransay to No's 33 and 34 Scalpay in 1842 and his  ancestors are still there. Donald's brother's Ronald moved from Taransay to  2,Finsbay. Hugh had tenancy of 21, Kyles Scalpay,in 1824 he  moved to 3,Carragrich and finally settled in Grosebay. Roderick was given a croft  in Borve and Murdo settled in Barra.

MacAulay's and MacDonald's can be traced back to the seventeenth century as tenants  in Baleshare.Macdonalds of Illeray are direct descendants of Macdonald of Clanranald  (Siol Gorraidh)and lineage can be traced back to King Cormac Uifhada MacArt of  Ireland  c0266. 
 Maclellan and MacAulay families of North Uist  have always 
 been closely linked. Tradition is that two MacAulay brothers,  accompanied by a  MacLellan nephew (i.e. son of one of their sisters) were  brought to South Uist c1600  by Lord MacDonald of Clanranald, the then  owner of South Uist, as groomsmen for his  horses. The MacAulay brothers and their MacLellan nephew came  from either Coll or Tiree. 
 After a few years  in South Uist the three moved up to the 
 Baleshare area of North Uist and  at a still later date some of the MacAulays and  MacLellans from Baleshare  moved up to the Bayhead area. All MacAulay's and  MacLellan's in North Uist are believed to have originated from these three individuals.