I assume you are talking about Collie. He isn't doing that at all. The money he is making will not set up his kids and grand kids. Heck, there is a good chance it won't even set him up. He will make $715,000 this year. He has made just over 2 million with Indianapolis.
Lets say he gets injured again, and knocked senseless this year. He basically is selling his brain for $715,000. That is pennies. Lets say when he signed with the Colts and looked good, he bought a nice house and a nice car for him and the wife. $50,000 per car and $500,000 for the house. That's $600,000. Take out taxes from his earnings and that puts you at just under 1 million left from his first deal. Lets say they went on some vacations and lived on $100,000 per year since then. That means he now has less than $500,000 left.
Now, after he pays taxes on his new deal, he will have around $464,000. That means before he buys groceries, BEST CASE SCENARIO, he will have $964,000 in the bank. That isn't setting anyone up for life. If he wants to live off that for the rest of his life, that's less than $40,000 a year. Yikes.
I don't think this has anything to do with setting up grand kids and more to do with "oh ****, I'm broke now, the wife is used to living large, and I need money."
He is sacrificing decades of his for a piddly $700,000 grand. Crazy. I hope for his family he stays healthy.