Must say my initial response to the heading was "my kids have taught me the true meaning of frustration" ... but that's only cos I'm TTing DS1 and poo-in-the-undies is driving me batty LOL.
My kids have taught me that it is possible to be so full of love my heart could burst, so full of frustration my head could explode and so full of giggles, cuddles and kisses from two little boys that my arms will never be long enough to keep them close to me at all times like I might wish. They will grow up too fast.

