The James Weir family migrated from Scotland to Ireland. James Weir ,jr was born 1801 in Ireland and later migrated to Kentucky USA. The James Weir family lived in Lisnabreeny House in County Down which is now owned by the National Trust and was the site for a cemetery for American Military.
You probably have a fair bit of information already if you have been able to trace back to James Weir born 1801 in Lisnabreeny House. To save researchers going over ground you have already covered, what is it you would specifically like to find out?