Dad is moving in, will Medicaid allow dad to contribute to household bills without penalty if he applies for Medicaid down the line?

Dad has early dementia and will be moving with me next month to keep a better eye on him. He is adamant about contributing to some house hold bills, and food expense, but I'm concerned that if he has to apply for Medicaid down the line they will count it as a gift since all bills are under my name. Does Medicaid have a cap say $500 a month in which a parent can contribute towards home expenses when moving/living with there child?