Grand father had 50 per cent share in property
2) on his demise your grandmother , your mother and uncle would be his legal heirs
3) your grandmother can only bequeath her share in property toyou and your brother by will
4) you should apply for probate of your grandmother will where she resided at time of her demise or where property is situated
5) contact a local lawyer and contest the suit filed by your uncle
6) your uncle will have to serve you summons at your address in Australia