This year I managed to do the following to both my brother and my sister, so I wrote this by way of apology:

What Forgetful Brothers Do

They mean to call you on your birthday,
They find they can’t get through,
Then what happens next
Is what forgetful brothers do:

‘I’ll email them tomorrow’,
They decide, and so they ought
But when tomorrow comes around,
Life’s crowded out the thought.

They remember when away from home
Or when lying in their bed
“I would remember now”, they say
In shame and shake their head.

Illness, tiredness, business,
It all is no excuse
For poor communication
Like an impolite recluse.