Sir Mark Thatcher said his mother Baroness Thatcher would be "greatly honoured as well as humbled" by the Queen's presence at her funeral next week.
I will be leading tributes to Lady Thatcher, Britain's greatest peacetime PM, in the House of Commons at 2.30pm.
Green Party MP Caroline Lucas said she would prefer to spend time in Brighton than pay tribute to Baroness Thatcher.
The Labour MP for Rotherham Sarah Champion said Thatcherism "tried to destroy our town".
I'm not in Parliament today as I my time is better spent helping #Rotherham. Thatcherism tried to destroy our town & community, they failed!
A special session of Parliament is to be held today, with MPs and peers being recalled to pay tribute to Lady Thatcher. The Baroness died on Monday at the age of eighty-seven.
Both the House of Commons and the House of Lords are to 'consider the matter of tributes' to Baoness Thatcher of Kesteven at 2.30pm on Wednesday 10th April 2013
MPs and peers will today pay tribute to Baroness Thatcher after her death on Monday aged 87, after a stroke.
On the death of previous Prime Ministers, the Commons has marked the occasion with relatively brief adjournment debates - not a Government motion as tabled today.
When Edward Heath died in July 2005, MPs paid tribute for 63 minutes on an adjournment debate.
MPs and peers will today pay their respects to Baroness Thatcher after Parliament was recalled from its Easter recess so tributes could be paid to the former prime minister.
They will debate a single line motion which reads: "That this House has considered the matter of tributes to the Rt Hon Baroness Thatcher of Kesteven LG OM."
The Prime Minister will lead the debate on the death of Lady Thatcher, Ed Miliband will follow, before Speaker John Bercow then calls MPs to contribute.
The order paper for proceedings indicate the debate may continue until 10pm, at which point Leader of the House Andrew Lansley will adjourn the Commons until its planned return from the Easter recess on Monday.
Labour will suspend campaigning in the local elections until further notice following the death of Baroness Thatcher, senior party sources have told the Press Association.
Former PM Tony Blair has paid tribute to Lady Thatcher:
“Margaret Thatcher was a towering political figure.
Very few leaders get to change not only the political landscape of their country but of the world. Margaret was such a leader. Her global impact was vast.
And some of the changes she made in Britain were, in certain respects at least, retained by the 1997 Labour Government, and came to be implemented by governments around the world.
As a person she was kind and generous spirited and was always immensely supportive to me as Prime Minister although we came from opposite sides of politics.
Even if you disagreed with her as I did on certain issues and occasionally strongly, you could not disrespect her character or her contribution to Britain’s national life.
She will be sadly missed.
Lady Thatcher's funeral will be ceremonial with full military honours, similar to the Queen Mother, but she will not lie in state, as was her wish.
The Prime Minister David Cameron has spent the day on the campaign trail in Eastleigh.
The Prime Minister surprised residents by knocking on their doors to try and drum up support for his party's candidate in the constituency's by-election on tHursday 28th February 2013.
The flying visit follows days of campaigning by other political heavyweights, all hoping their party can gain the disgraced Liberal Democrat Chris Huhne's former seat. Our political correspondent Phil Honrby reports.