OK, I understand. Unfortunately, you are not able to do anything related to the new law at this point. You can file your own and receive, but you can not file and suspend. You can not do the latter because you are not yet of full retirement age (FRA). That has always been the rule and continues to be the rule. What is unfortunate, and this IS the new rule, is that when you can finally suspend, all suspensions will be automatic blanket suspensions, thereby cutting off son's benefit, should he take a DAC (disabled adult child) benefit under your work record.
For those that turned 62 before the end of 2015, unrelated to this suspend rule of 5/1, if applicable they can still file a Restricted application for spousal benefits at their FRA (if eligible), while still deferring their own benefit, so that their own can grow to age 70. Not related specifically to 4/29/5/1, but it is part of the new law, that those under 62 will no longer have that option. It cost people about $50k on average from their retirement, unfortunately.
So, when you do eventually file for your own benefit, your son will be eligible for up to 50% of your primary insurance amount. Depending on what that is, it may not be very worth it to file earlier than you would have, so he can do this, particularly since he is getting SSI now. When you do file, he will switch to DAC, but I am not sure there is a rush for this, so if you were planning on deferring yours to age 70, that may still be desireable. Of course, you may OTHERWISE want to file at 66 (or one of you) so that your spouse, or you, who ARE grandfathered under the new law, can file for a RESTRICTED spousal from 66-70 while still allowing his/hers to grow at 32%. Have to do all the math to see the financial benefits and costs for a variety of scenarios, but those are the general rules you have to go by.