I have 2 Isaac Franklins 1. the son of Samuel Franklin and Dorcus Burns as previously mentioned and; 2. Issac Franklin the son of Levi Franklin...goes something like this:
1. Samuel Franklin (1780-1857) m. Dorcus Burns
2. Levi Franklin 1803-1886 m. Barbara Taylor (1792-1880)
3. Isaac Franklin (no date listed) but his siblings were born in 1820's...could this be your Isaac Franklin?