Yes, donations to your grandchildren's IL 529 plans are deductible on your KS state tax returns.
From KS Secretary of State - 529 Education Savings: Kansas taxpayers may take an annual deduction of up to $3,000 ($6,000 for married, filing jointly) from Kansas adjusted gross income for contributions into each beneficiary's account.
From Kansas 2020 Individual Income Tax Instructions (page 18): Enter contributions deposited in the Learning Quest Education Savings Program (LQESP) or qualified 529 tuition programs (as defined under IRC Section 529) established by another state, up to $3,000 per student (beneficiary); or $6,000 per student (beneficiary) if your filing status is married filing joint. You may have your direct deposit refund sent directly to your LQESP account. Visit learningquest.com for details about saving money for higher education.
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