A. First you need to study seller's property origin because Where an intestate has left a widow and if he has left lineal descendants, that is, children and children’s children, 1/3 of his property shall belong to the widow, and the remaining 2/3 shall go to the lineal descendants. If the intestate has no lineal descendants, but has left persons who are of kindred to him, ½ of his property shall belong to the widow and the other ½ shall go to those who are of kindred to him. If the intestate has left none who are of kindred to him, the whole of the property shall belong to the widow.
B. You would better take the consent of all the children of seller to avoid future complications.
C. You can put this in the local newspaper before purchasing the property by calling public or any legal heirs to put their objection within 15 days from the date of publications.
D. Contact a local advocate to complete this task.