A family-friendly fundraiser will be held Saturday 5 April at Banyo Rugby League Club to support Lani Fabila, a mother of two, who was recently diagnosed with leukaemia while 24 weeks pregnant.

Their family is of Papua New Guinean, Aboriginal (Jabirr Jabirr, WA) and European descent.

Her sister Kiri said the diagnosis came after a routine blood test raised concerns when Lani presented to the hospital with severe back pain.

"She would like to spread awareness, especially to those who have a family history of leukaemia, that pregnancy can mask symptoms of leukaemia," she said.

"So it is really important to stay diligent in getting check ups when your body is not feeling right," Ms Fabila told the National Indigenous Times.

Lani's biggest support is her partner, Clinton.

"Being the partner of someone going through chemotherapy treatment at the same time as having a newborn baby is a huge job, and we have seen firsthand how incredibly strong Clinton has been to carry his family through this tough time," Ms Fabila said.

"It's so important to be there for the person going through treatment, but equally as important to be there for her biggest support."

The diagnosis has taken a toll on the family, but Kiri said they remain focused on supporting Lani and her children.

"She has shown immeasurable strength for herself and her babies," she said.

"While there's not much that we can do to help her medically, we are doing anything and everything possible to support her and her family."

Lani recently underwent a transplant, and her brother Geoff said the fundraiser aims to support her recovery and reduce financial stress over the coming months.

"We are fundraising for Lani and her family while she gets through her post-transplant recovery," Mr Fabila said.

"She will have regular, ongoing appointments at the hospital clinic, which come with associated expenses for parking and food."

Mr Fabila said organising the fundraiser had also helped the family stay strong through a difficult time.

"Organising the fundraiser has given us a purpose and an opportunity to help that we know will benefit Lani and her family," he said.

"It has helped us cope as a family and that is why the day will be as significant to us as it is to our sister."

Ms Fabila has painted five original artworks for the event, which will be available alongside print copies.

"Painting is a meditative process for me, so creating these pieces helped me get through some tough times," she said.

Prints can also be purchased online via Instagram @art_by_kirifabila.

The event will include live music, food, raffles and performances from Tjaka, Paiti Entertainment, a Japanese Taiko Drum group, and improvised sets by touring musicians from the family.

Mr Fabila said the support from the wider community had already made a difference.

"The support we have received from family and friends for Lani's fundraiser so far has been overwhelming," he said.

"Supporting a loved one who has been diagnosed with cancer is one of the most unfortunate rollercoasters we can find ourselves on."

"In our short experience with our sister, we have learnt the most important action is to stay tight with our family and friends."

The fundraiser is ticketed at the door, with entry $15 for adults and free for children under 12.

Free parking is available, and the club's licensed bar will be open.

For those unable to attend, donations can generously be made via Pay ID to 0418774985.