Assuming that Thomas Newberry was the, presumably illegitimate, son of Ann Swingler, her parents would seem to be William Swingler and Frances/Francis Allen who married in Knighton in 1798. They had several children in Oadby - Thomas 1799, Benjamin 1802, William 1804, Benjamin 1806, James 1809, Lavenor 1812 and Joseph 1815, before the last three in Church Langton - Anne in 1817, John in 1819 and George in 1821.
In 1851, William was in East Langton, which he gave his birth place, with Frances as Great Glen. Three sons were also in East Langton - Jospeh and James, b Oadby, who is next door to George, b East Langton.
David