Revisited on Family Tree Circles

My Ancestor William Adams Married Jane Adams nee Adams in Armagh County Northern Ireland -yes that's right an Adams marrying an Adams.
Their son William was born in 1838 in Armagh County & at the age of 20 emigrated to Australia where he met & married Sarah Slingo in 1860.They had 8 children together.Unfortunately William died early at the age of 40 in 1878 from a condition he had suffered from for 3 yrs.He left Sarah a Widow @ 37yrs with 8 children ranging from 3 to 16yrs of age.
Did William & Jane have other children besides William who perhaps did not emigrate or did other members of the family emigrate also? This I do not know.
Were William & Jane farmers?
Was Armagh their closest town /village?
Where were they buried ?
Are their headstones intact in a local cemetery?
Are there other descendents still living in Armagh County ?