This is another older Peter (not son of John), as this Peter married to Catherine died in 1844 aged 36, and in 1845 Catherine remarried Samuel Jones.
Peter was the posthumous son of Peter Millington, a collier, and wife Mary Boyle of Shotton.
23 Aug 1835, Peter Millington married Catherine Ellison at St. Mary's-on-the-Hill, Chester, Cheshire, England
In 1841, Peter and Catherine (30 & 25) were living at Wood Lane, Ewloe Town, Hawarden with Peter, John and William (6,4,& 2)