Was it self acquired property of sisters husband.?
What was age of minor son at time of sale ?
3) if it was ancestral property then court permission was necessary for sale of property by sister husband
4) minor son has to within period of 3 years of attaining majority file suit to claim his share in property and to set aside sale deed in favour of mother
5) the officer would not consider son objections unless it is ancestral property or son obtains court orders restraining transfer of patta