... I thought not, but it's very windy here and I'm thinking maybe I'm wrong? (They're about 18" high atm, and I've got 24 of them in a 'hedge', so I can't really be bothered staking them if it's not necessary).
Just re-read your post. Sorry to hear about your dad.
Plant him a teddy bear sunflower - you can grow them in pots they are so short, but have lovely big sunny heads. You might be able to take it to him to give him a bit of sunshine.