F S Duggan was s/o Wm Duggan + eng born wife (?marr in England - looks like a very late marr for Wm as age diff large)
Wm was son of Rev Wm Duggan (one time curate of St Marks, then vicar of Marown until his death in 1862) + wife Mary Kelly;

The Rev Wm Wm Duggan was only son of Wm Duggan + wife Ellinor Cubbon but I don't have bapt for him but parents m 1794

There are some will summaries on Manxnotebook + some accounts of Rev Wm Duggan