“Catherine’s absence speaks volumes,” the source said.

“I think keeping the numbers down is a perfect ‘excuse’ for Catherine to stay away.

“It was always going to be the two brothers,” as an insider informedHarpers Bazaar.

Kate Middleton smiling

The Duchess is keen to “alleviate her husband’s stress and sadness” above all else.

Kate Middleton posing in blue coat

Kate Middleton fusses with her hair

Kate Middleton smiles for photographers