I have been looking into this family - John Barlett Keay - as his sister Sarah married inot the Lavender family and is connected to my husband Lavender/Keay/MacDuff/Warby family. Their parents were James Keay who married Elizabeth Dainty. James was born abt 1790 and died before 1851. His wife Elizabeth nee Dainty can be found in the census for Wombridge living with her daughter Jane and her husband William Powis in the 1871 census. In the 1851 & 1861 census she is livng alone next door to Jane & William Powis and is a Grocer in Wombridge, Shropshire.
Hope this helps. Would love to hear further information about you family line.