Premanand Maharaj Ji
How can I help my elderly parents spiritually?
Teach parents naam jap
There is nourishment of this world and of the next, and the next world is nourished by Bhagwan's name. Teach your parents to chant, and you benefit as well.
Teach them to sit a while and chant Radha Radha. Give them a counter. This will benefit you too.