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Prince Harry: William and Kate are a perfect match

March 31, 2011 / 6:05 PM EDT / CBS/AP

Prince Harry joins the Walking with the Wounded team on March 31, 2011 in Spitsbergen, Norway. David Cheskin/WPA Pool/Getty Images

(CBS/AP) Prince Harry says he'll be careful not to offend his grandmother, Queen Elizabeth II, with his wedding speech honoring his older brother Prince William.

He told "Good Morning America" that he'll have to be selective when it comes to what he says because the monarch will be in the audience at the April 29 nuptials and reception that follows.

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The 26-year old added that he welcomes future sister-in-law Kate Middleton into the family and that she and William are a perfect match.

Harry also admitted that there were some who doubted whether the marriage would ever happen, hinting that his brother took a long time to propose.

The interview aired Thursday as Harry continued on his trek towards the North Pole in support of injured servicemen. The prince has made it a goal to raise 2 million pounds ($3.2 million) for the Walking with the Wounded charity.