all property belongs to my grand father G he had three son A B C and two daughters D E. three sons A B C one daughter D died G ALSO died . E(daughter of G) had three sons s1 s2 s3. in 2008 S2 asked registered POA from E S1 S3 for some purpose. by trusting S2 words E S1 S3 signed the document, finally S2 had missapropriated and made fraudlent by change of gift deed instead of POA DEED in SRO OFFICE and got registered signature from E S1 S3 as gift deed . by 2015 we found it and cancelled the gift deed by three members E S1 S3 SIGNATURE IN SRO OFFICE and informed to S2 the next day. on 24 Nov 2016 S2 had send a lawyer notice from G M ANANTHA KUMAR CHENNAI ADVOCATE by stating ilateral cancellation to three members E S1 S3. actually E is an cancer patient now she cured but some times not felling well. What shall we do please suggest and incase if challenged what will be the judgement. A B C D have legal heirs. all are HUF property.