contest a will

[Longstaff]

My mother-in-law died 9 years ago. She left everything to her only neice (aged 6) in trust through her solicitor. My husband was very agrieved at the time that he had been totally left out. The property was sold and is in trust until E is 25. My m-in-law only had two childen and her previous wills had always included both sons, with no provision for grandchildren. M-in-law had a long history of mental illness, paraniod scyopherena (think that is how you spell it). She had been hospitalised to my knowledge at least twice. She was a v. diffiuclt person to deal with and constantly challenged people. The family became separate because of this and we were the only ones with contact. To cut a long story short - we sent an updated picture of her only grandchild and subsequently she changed her will and died shortly afterwards. No provision was made for either son. We did not want to contest as it would put more strain on family. With hindsight this has been a bad decision as we have no contact at all from the solictor - no updates on the fund - there have been 3 further grandchildren added and no provision for this. We would like to contest now - is this possible? We would like the will to be settled between the two sons only? - or at least shared between all grandchildren (4 in total for interest - only 1 being ours). I presume medical records will still be available? There are witnesses as to her mental state - she suffered for most of her life, a v.sad case and I am sure she would not have wanted to disown her loving sons and all her grandchildren. Can this be done?