This isn't mean. It is evil. It is also likely not valid. Plus, if you do not mention your children, ALL of them, in your will, they can file for a portion of the estate. Many states rule that if you die with-o a will, your estate is divided between your surviving spouse and your children, ALL of them. If you say that x gets nothing, some states will rule the will invalid. That is why many wills mention leaving $1 or $5 to this or that child, because then you didn't forget them, you gave them what you thought they deserved. Some states let you say that X child gets nothing and X child cannot contest it, but other states say you have to give them some small amount and often it is a certain amount or else they can contest and get the same % that the other children get.
I believe that many states say that all children must split half of the estate and the spouse gets the other half, or that the spouse and children get the same %. Leaving a will that complies with the law is the only way to change that.
These are NOT your family. NO WAY. They are the biological donors, period. Actually, in some states a letter like that, esp iwth a photocopied signature the way that one is, and with no witness, is not legal and could be grounds to claim abuse and for the child to sue the estate for the abuse and receive pain and suffering.
It also could be used to prove undue influence over your mother if her mental state has deteriorated or she was forced or coerced. Heck, you might even be able to prove fraud if her sig is photocopied on the original of the letter or otherwise shows signs of not being hers and/or she is not competent to sign legally.
You would be best off to just walk away and refuse any/all contact with them. They are not worth the air they breathe or the carbon and water that makes up their bodies.
It is truly amazing that you are such a warm, loving and truly genuine person after being raised by such greedy, mean spirited, small minded ugly people. You are so much more than they ever could hope to be, and all their money and possessions are not worth one single bit of you. You are invested in what truly matters in this world and richer than they could ever have hoped to be.
I think it is pitiful that they are investing themselves so heavily in hurting you and being ugly. Whatever you believe comes next after this world, you will have a far better life there than these people can even imagine is possible. If they believed in reincarnation they would come back as the most miserable beings on the planet, or as humans who are truly devoid of any advantages and who has to learn how to be generous, loving, caring beings before they can even hope to pray for a chance at being a happier form of life. Or they would end up as the ghost of Christmas Ugliest if you believe in that.
As children we are stuck with the family that we are born in/adopted by. As adults we learn that family is the people who love you and truly want the best for you and care deeply for you. L and the donors are not your family. The true friends you have now, like us, are your REAL family. The donors cannot even comprehend the value of what they have thrown away, and they for darn sure are not worthy of you!