It will be a "tough and tearful week, even for the daughter of the Iron Lady," Carol Thatcher has said.
The daughter of Baroness Thatcher made the poignant remark in a statement to reporters outside the family home in London's Belgravia.
She thanked people who had sent messages of sympathy and support, which had given her strength in the days before Wednesday's funeral for the former prime minister at St Paul's Cathedral.
Ms Thatcher, wearing a black shawl, black trousers and clutching a pair of sunglasses, posed for photographers with brother Sir Mark after giving her statement outside the house in Chester Square.
She said: "I would just like to say that I feel like anyone else who has just lost a second parent. It's a deeply sad and rather thought-provoking moment in life.
"My mother once said to me: 'Carol, I think my place in history is assured'.
"The magnificent tributes this week, the wonderful words of President Obama, and others of colleagues who once worked alongside her, have proved her right."
She thanked those who had sent her "messages of sympathy and support", adding: "These have given me strength.
"But I know this is going to be a tough and tearful week, even for the daughter of the Iron Lady."