CHICAGO (WLS) -- Giving Tuesday has become the largest single day for habitable giving, raising nearly $4 billion worldwide last year for thousands of charities like GiGi's Playhouse.

Math tutoring is one of the many services GiGi's Playhouse offers to those with Down Syndrome. The charity has been around for 23 years, since its namesake, GiGi Gianni, was born with Down Syndrome.

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"We give them programs to read, which is good," said GiGi Gianni.

GiGi's now serves some 35,000 clients in locations around the world, and they charge those families nothing for those services. Isaiah Marrero and his family come from East Dundee.

"All the programs are all run 100% through donations, which really helps families like ours," said Nidia Mar

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