I put about $200 dollars at a time in I bonds. Should I be?

I started getting child support after being divorced since 1989. The kids are raised, but I guess the judge didn't forget, so now I have money coming in like manna from heaven. I go to the bank, cash the checks and purchase I bonds. Should I be putting this money in some other type investment? I am not about to give it to my grown irresponsible kids.