So, 2 years after Mrs K wrote the will leaving the property to the 6 grandchildren, for reasons unknown, the property was put into the name of the grandchildren’s mothers?
When the property was mortgaged by one of the sisters/grandchildren’s mother, as the property still in joint names of the 2 of them? Who is now named as the proprietor of the property? There is nothing attached to your reply.
Who apply for probate? Who were the executors of the will? When did Mrs K die?
Have the children spoken to their respective mothers about this?
The most important question here is surrounding the transfer to the 2 sisters, children’s mothers, in 2004 as to why that was done.
It may be that Mrs K left the property to the grandchildren in the will and then decided either to transfer the property to her two children (the grandchildren’s mothers) forgetting that she had left it to the grandchildren in her will but intended her children to have it or she may have transferred it to her two children (the grandchildren’s mothers) to be held on trust for her grandchildren until the grandchildren reached 18.
If she transferred the property to the two sisters/mothers intending them to have it and forgot that she had left it to the grandchildren in the will, then there is nothing that can be done about the provision in the will because at that stage, she no longer owned the house.