Your grandfather should speak to an estate planning attorney. I don't understand what you mean by "another person sign on the house."
Costs vary. Really, your grandfather should think in terms of an "estate plan," and costs for this can depend upon his particular situation.
Avvo kinda discourages our quoting of prices on this site, but in general, fees for estate planning are within the reach of a person of ordinary means. And they're worth it. I would strongly discourage your grandfather from using a form book or from using an online will-drafting service.
I take "there's another person sign on the house" to mean that the deed to the house presently reflects two owners. If that's the case, then yeah - it matters. Your grandfather can only leave by will the share of the house that he himself owns. If it's only 1/2, then the beneficiary of the will inherits 1/2 a house.
Anyway, as stated, an estate planning attorney can work through these details with your grandfather.
Best of luck.
No attorney-client relationship or privilege is formed by this communication. This answer is to be considered as a general discussion of legal principals and is NOT LEGAL ADVICE. If the asker seeks specific legal advice, he should retain an attorney, who will naturally take the time to consider all aspects of the case and perform any necessary legal research.
It is recommended that you refer your grandfather to an estate planning attorney to properly draft the Will and other relevant estate planning documents.
AVVO or your local county bar association can provide attorney referrals.
If you mean there is another owner of the house, the most your grandfather could give you under his Will is his OWN interest in the house, unless he holds the deed with another as joint tenants with rights of survivorship and in fact survives the other owner. It would be advisable to meet with an estate planning attorney, who can also review the current deed. Costs vary for Wills, and vary widely at times depending upon the skill and specialization of your attorney, but it should be 'affordable'.
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