墓に布団は着せられぬ
Meanings
1
you can't put a futon on a grave; it's too late to show filial piety after your parents are dead
Proverb meaning that once someone has died, you can no longer do anything for them; used to encourage caring for parents while they are still alive.
Be good to your parents while they are well. As they say, you can't put a futon on a grave.