More than 40 Moulders from across the country came together at the site where two of the city's first settlers, Joseph and Catto Caroline Moulder, are buried among 14 of their family members.

The family raised funds to have the restoration work done to the grave site, which vandals damaged in the 1970s.

Victor Moulder said after the original desecration, when it was discovered a skull was missing, his ancestors' final resting place had continued to deteriorate.

With all but his sister Pamela Condon now living outside of Orange, the family decided to come home to see the completion of the job and make sure their story wasn't buried.

"There's a great benefit in keeping the family history alive," Mr Moulder said. 

"They developed a great deal of NSW and opened it up to settlers."

Joseph Moulder arrived in Sydney from England in 1818, as did Caroline Moulder from Ireland.

According to family history, Mr Moulder was one of the first 12 settlers to cross the Blue Mountains and eventually settled where Orange is today.

MAP: The Moulder family's extensive footprint in Orange ...

He called his first house Bloomfield on the 1200 acres he once owned south of the city.

The couple had many children, some who died as very young infants and some whose names were lent to Orange's city streets, including Edward, Dora, William, Caroline and Catto.

Dora's husband John McLachlan left his own legacy, in both the street named after him and the establishment of the mansion now occupied by Kinross Wolaroi School.

The Moulder family reunion took place on the weekend at Endsleigh House, the historic homestead built by their ancestors and believed to be the oldest standing home in Orange.

It is now occupied by Barbara Bagot, whose father Ted Bagot was descended from one of Mr Moulder's daughters, Eliza.

The whole family, including the oldest living member, 96-year-old Eileen Rodgers, will visit the Holy Trinity Anglican Church on Anson Street to see the stained glass window dedicated to the donation their family made which allowed the church to be built.

Mr Moulder said it will be a special weekend as for many it'll be the first time they've visited the two sites and the first time some of them have seen each other in over 50 years.

"When you're from all over and you live your own lives it can be a bit hard to keep up,' he said.