I presume that the property belongs to both of your parents. At the moment of death of your father, his share in the property was automatically transmittes to his legal heir (may last will and testament man o wala). His legal heirs are you, your mother and your siblings. Thus, your mother cannot sell or donate the whole property without the other heirs' consent. Best to do is to have an extrajudicial settlement with absolute deed of sale or waiver of rights. You consult a lawyer kung san ka makakatipid kasi magbabayad kayo ng estate tax plus capital gain's tax or donor's tax. The fact that you reďeem the property does NOT make you automatically entitled to the property as owner. Your rights include only the right to be reimbursed by the other heirs dun sa binayad.