Go to your son and apologize to him!! Then accept that the child IS your grandchild, one way or another!!!
I Was Banned From Seeing My Newborn Granddaughter, and My Kindness Was Repaid With Lies

A loving grandmother shared an emotional letter about the heartbreaking moment she found out her granddaughter might not be biologically hers. She went in excited to finally meet the new baby, but the visit ended up uncovering a painful family secret and forcing a choice that could change their bond forever
Dana’s letter:
My DIL had a baby girl three months ago, and I still haven’t been allowed to meet her. Every time I ask, she says the baby is ‘too fragile’ for visitors... but they’ve got a nanny there every single day.
I finally got fed up and showed up unannounced. My son opened the door and went completely pale when he saw me. I went in and just stopped in my tracks. The baby wasn’t what I expected at all; dark hair, dark eyes, and nothing like the picture I had in my head. That’s when it hit me, and I went pale too.
My son took my hand and admitted that the baby was a product of his wife’s brief affair that happened years ago, early in their relationship. He chose to raise the child as his own, and they kept the truth from me because they were afraid of how I would react.
I was overwhelmed and hurt by the deception and heartbroken that the child I thought was my grandchild wasn’t biologically related to our family. I told my son he was no longer my son, and his wife wasn’t welcome in my home. I also told them that neither this child nor any future children should expect anything from me. Then, I left.
Now I’m not sure what to do. The relationship with my son is shattered, and the future of our family is uncertain.
— Anne
Our advice.

Anne, you’ve totally thrown a wrench into the family dynamic. You pushed your way in, and reacted as expected by the parents. You have a son. Idk why he’s suddenly not. Their family business is no one else’s business, including you. If you continue in this role of judgmental MIL, you will be one solitary grandmother. I’m sorry you feel this way.
A very hateful and heartless woman you are. You did your son and his family a favor by throwing them out of your life. Happy lonely rest of your life.
If affair was years ago then having a 3 month old baby makes no sense. Showing up unannounced is totally rude. Your attitude is very hateful and I wouldn't want to be around you either.
And now you know why. Because your son knew what you'd be like. Don't expect help later in life when you need it. I hope you never hear from them again. I hope that they move far away and when you hear that they've had "your grandchildren" they tell you to f off before ignoring you. Is your son's child, end of.
Anne, thank you for opening up about such a raw and emotional experience. Your letter shows just how complicated family relationships can get, especially when secrets and betrayals come to light. It’s natural to feel hurt, shocked, and even angry that your son and daughter-in-law kept this from you for so long. The pain of learning that your granddaughter isn’t biologically connected to you can feel like a double loss, not just of trust, but of the picture you always imagined for your family.
At the same time, it’s important to remember that this little girl is innocent in all of this. Your son made the choice to raise her as his own, and in doing so, he’s trying to build a life of love and stability for her. If you close the door completely, you might miss out on a chance to form a meaningful bond with your son and this child, even if the circumstances are far from what you hoped for.
Taking some time, seeking support, or even speaking with a counselor may help you process these heavy emotions. You don’t need to forgive right away (healing takes time), but keeping your heart a little open could give your family a second chance at connection.
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