Thanks for the responses. If anyone else has ideas, I'd love to hear those also.
Some answers to LAlearning, and a couple new questions:
I'm basically a living emergency fund, so that's currently "taken care of". I'd just like to help him build long-term savings that will be separate from me. Also, I'm in a high tax bracket, and it occurs to me that since I've already decided to be 100% committed to helping him long-term, my contributions would be maximized if I start contributing to his savings now. In other words, if I save money now under my name with plans to give it to him later, it will be taxed all along the way at my high tax rate. If I help him start building his own savings now, the high tax rate only applies once, when I earn it. After that, the taxation is all his, which will be low. Am I thinking about this correctly?
Not worried about his use of the money. So cutting a check is fine. I was just wondering if I could choose to gift directly into his account just because I wanted to do it that way. Anybody know if it can be done that way?
So I guess my two options for taxable would be to open a Vanguard Brokerage account to allow CDs and other things to be part of the AA. Or just buy mutual funds without a brokerage account? So far my only investing is through my 403b,401a,457b,IRA, so I'm still a noob when it comes to taxable investing. What are the advantages/disadvantages of the brokerage account compared to just buying funds outright? Is the brokerage account costly or a pain to manage?
And finally, I can't think of any other way to do this than some sort of taxable investing plan as discussed above. Am I missing some other option?