Parental Estate war

I and my sisters stand to inherit through intestacy from our Mum. My brother is fighting saying he should get 100%. He has placed papers with a court to sue us all, and did so on March 1sr. We were told he must serve the papers by 1st July...if he doesn't, what happens? Is it over? Can the Administrator hand out the estate? We saw a young solicitor who said it would be over, but he seemed shaky on some things...