Butler, Hamilton, Reemtsen, Markland

Trying to find info on the above surnames - Andrew Jackson Butler married Polly B Hamilton (who's brother William Hamilton married AJ's sister Isabella!) and moved to Havana area in 1840's - they had a son John M Butler who married Bruno & Martha Hamilton Reemtsen's daughter Mary Lenora. John & Mary are my GG grandparents and I'm drawing a blank on the Hamilton & Markland families???