In my research, I only have the following children for John Showers*(1776-1845) and his wife Catherine:
Michael(1798-1874), Hannah(1801-1887), Caleb(d.ca.1835), Daniel(1806-1887), and Alexander. But,I have found no Thomas.
*This is the John Showers who is the son of Michael & Hannah (Von Toch) Showers.
Are you sure that you have the correct family??? There were/are so many Michael Showers running around, in both Canada and the United States, that it makes it difficult to trace. In fact, I have two Michael Showers in my Canadian branch alone, that were both born in 1798. (Michael, son of John listed in above paragraph and his cousin Michael, son of Michael and grandson of Michael & Hannah). Talk about confusing. almost all of Michael & Hannah's children and grandchildren lived in ONT, Canada, as Michael sided with the British during the American Revolution.
Maybe if I had more information on Thomas, I could help you. Where and when were Thomas and his descendants born, married, died etc.. I will do my best to try and help.