Sonny Bill Williams and his sister Niall are one of four sets of siblings that could be heading to the Rio Olympics as part of New Zealand's men's and women's rugby sevens teams.

Uncapped pair Terina Te Tamaki and Janna Vaughan were added to the New Zealand women's sevens squad of contracted players for 2016 on Monday.

The 12 players to this year's Rio Olympics will be selected from the 22-strong squad named.

Te Tamaki is the younger sister of All Blacks sevens squad member Isaac Te Tamaki.

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The Waikato 18-year-old's inclusion means there are now four sets of siblings spread over the women's and men's squads.

The others are Jordon and Joe Webber, Niall and Sonny Bill, and Stacey and Beaudein Waaka.

Vaughan, 27, was part of the Manawatu side that won the national title at the weekend and has represented New Zealand in kickboxing, league and rugby.

Also named are Aucklander Huriana Manuel and Manawatu skipper Selica Winiata, who return after lengthy injury breaks.

New Zealand finished fifth in the opening round of the world series in Dubai and are looking for better at the Sao Paulo tournament on February 20 and 21.

They will have a training camp in early February in Florida, where they will also be based before the Olympics.

The players will then spend two days in Rio de Janeiro to familiarise themselves with the city before travelling to Sao Paulo.

New Zealand Women's 7s for 2016: Shakira Baker, Honey Hireme, Carla Hohepa, Lesley Ketu, Terina Te Tamaki *, Stacey Waaka, Jordon Webber (all Waikato), Michaela Blyde, Sarah Goss, Janna Vaughan *, Selica Winiata (Manawatu), Huriana Manuel, Kayla McAlister, Tyla Nathan-Wong, Niall Williams (Auckland), Hazel Tubic, Portia Woodman (Counties Manukau), Kelly Brazier (Bay of Plenty), Gayle Broughton (Taranaki), Shiray Tane (Hawke's Bay), Ruby Tui (Canterbury), Kat Whata-Simpkins (Wellington)

- AAP