My mom recently died she had a will that i believe my sibblings changed [she had alziemers],how do i find out what was in the will?
Do you know who drafted the original will? Did that attorney take part in the alleged "change" of the will, or did your siblings do it on their own or with the help of a second attorney? That would be my first inquiry. The attorney may not let you see it (unless you were named as the executor), but if you are considering litigation, you need to know that the original, more favorable, will is still out there and available to be entered as evidences.
Whether you can find a copy of the old will or not, overturning a will on the grounds of undue influence or lack or testamentary capacity is an expensive and difficult undertaking. I'm sorry I can't be more encouraging for you. However, if we are talking about large sums of money, it may make sense to spend an hour with an attorney who specializes in probate law, and ask him or her about your particular case. Good luck.