Just to emphasize -- protect your best financial interests in the D. Period. It is financial business. Period.
You can always be more or less generous with your cash after the settlement agreement is in place. You can pay for whatever you want, put whatever you want in trust, and so on.
But, do not bind up your flexibility in a legal financial agreement that will be pretty much set in stone.
Insofar as impossible minimize your *legal* financial commitment to W. If you feel you have a moral commitment above the legal commitment, fine. Meet that moral commitment outside of the legal framework.