Gud pm. Extrajudicial Settlement is the way to go. But first, is it a conjugal property of your mother and your father? If so, then half of the property will have to be settled extrajudicially between you and your siblings, your mother included. Your mother retains the other half. Once settled, then the half property involved will have to be divided by 7 to obtain the amount of each share. then each of your siblings and your mother will waive their rights in your favor and each waiver will be subject to Donor's tax. With regards to the other half, your mother can waive her rights also in your favor and is also subject to Donor's tax but keep in my mind that it's larger than the other half because only one person is donating so expect a much larger Donor's tax. the tax table for a donor's tax is if it is below 200,000, then tax is exempt but you have to pay 2% of the excess over 100,000.
Now if your mother solely owns the property, then a simple will and testament will do.