Right now, every time you bring up putting Ben back in the will, your son hears it as damage control, not remorse. He doesn’t care about the paperwork; he cares that you valued “bloodline” over the child he fought years to have. Instead of talking about inheritance, write him a vulnerable letter explaining the “why” behind your mistake, not to justify it, but to show you understand the real hurt. That you made his son feel less legitimate and made him feel like the father he is wasn’t enough for you. Acknowledge that you didn’t just make a financial decision; you broke trust.
Use your DIL as a bridge, but not as a messenger.
Your DIL clearly still sees your intentions and is willing to help, but don’t use her to “pass along updates.” That puts her in an impossible position while she’s grieving her own loss. Instead, ask her what communication method would feel safest for your son right now, a letter, a voice note, or a visit where you don’t speak at all unless he initiates. Let her advise you, not intervene for you. It shows you respect boundaries while still taking responsibility.
Give your son space.
You can’t rush grief, and you certainly can’t rush forgiveness. Your son is grieving a baby, grieving the future he imagined, and grieving the realization that his own mother didn’t see his son as fully his. That’s a layered pain. Give him the time he’s asking for, but maintain a gentle, steady presence. Send small, occasional check-ins that simply say, “I’m here whenever you’re ready. I love you. No expectations.” Keep your focus on validating his feelings rather than defending your intentions. Over time, it’s your consistency and humility, not the inheritance changes, that may eventually open the door for healing.

