contesting a will on grounds of undue influence

It's not clear what your question is. If your father was ill enough to have been on a ventilator just prior to the time he signed his Will, then there may be some reason for you to suspect that there was some undue influence involved. If he has actually passed away and someone is now trying to offer that Will for probate, then you should contact an actual estate litigation attorney as soon as possible, because once the Will is submitted to the probate court you usually don't have a lot of time to delay. You may also want to check with the probate court in the county where your father had his primary residence (assuming this is a Georgia matter), to see whether anyone has submitted the Will for probate in common form. As a child of your father (assuming you are legally his child by birth or adoption and that you aren't a stepchild), you would normally be an heir. Neither your aunt nor your cousin would normally be your father's heirs if he had any surviving descendant. This can give you some additional evidence that a Will which makes provisions for them at your expense might be the product of undue influence. But in order to see if you really have a case, you'll need to actually talk to an estate litigator who can find out all of the relevant facts and circumstances. Don't wait, do it soon, and don't sign anything before you've talked to someone about your potential case. Good luck to you.