Leanne and her husband of 25 years, Christopher, will join 80 couples in renewing their vows at Bishop Peter Ingham's annual Marriage Anniversaries Mass on Sunday.

Joining the Wilsons will be Leanne's sister Rhonda Breeze and husband Mark, and their parents Ron and Alice Weston, who will celebrate 40 and 60 years of marriage respectively.

"We're all having milestone anniversaries in the same year, so we thought it would be really nice to all renew our vows together," Ms Wilson said.

"Mum and dad went in the Mass for their 40th and 50th anniversaries, and this is such a special year for all of us."

The Mass, to be held at St John Vianney's in Fairy Meadow, will celebrate dozens of unions.

There will be 21 couples celebrating 25 years of marriage, 16 couples celebrating 40 years, 24 celebrating 50 years, 15 celebrating 60 years, and one couple marking 66 years of marriage.

The marriages in Ms Wilson's family seem to stick, and she said it was no coincidence.

"We all just enjoy spending time with our partners, but it is also important to do stuff apart.

"We also have great role models. Chris's mum and dad have their 50 years of marriage next year. Everyone helps prop us up when we need it."