Thanks, folks, keep that advice comin'. I'm asking for it, after all.
The boy is almost six, and we've been separated since he was 3 1/2. We miss each other, but I grew up under an almost identical situation, except my parents weren't in the organization, and didn't have the longterm tension that she has felt against me. We share a bond, but either way I'm going to have to keep one side from just losing it over any move I make, whether it's my family or her family.