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CARMEL, Ind. – A mother is remembering her son lost to cancer by hiding Hot Wheels cars around town for strangers to find.

“It’s easy to sit around and be sad all the time, but the way I feel Brooks the most is through being happy and joy and helping others and I feel him close to me,” mom Tracey Blackmore of Carmel, Indiana told WTTV.

Brooks Balackmore, 6, was diagnosed with two astrocytomas in June 2015. The tumors were cancerous and inoperable. Despite radiation treatments, doctors discovered another tumor had developed in March 2016.

In May 2016, he passed away.

“He has younger siblings,” Blackmore told ABC News. “They are now 3 years old. They’re boy-girl twins and I miss the love that he would he would share with them.”

To cope with her grief and to remember Brooks in a happy way, Blackmore created baggies labeled “Finders Keepers #BeBrooksBrave.”

Inside each bag is a Hot Wheel car, statistics about childhood cancer, a copy of Brooks’ painting and a link to the St. Baldrick Foundation’s fundraising page.Brooks would have celebrated his 7th birthday on December 20. To honor him, his mom hid 200 #BeBrooksStrong baggies.

“We have a very emotional month here, so I wanted to bring it joy and happiness instead of sadness,” Blackmore said.

In addition to the baggies, the Brooks family has raised more than $20,000 for childhood cancer research, according to ABC News.