The assisted suicide bill was "stacked round with safeguards" to prevent a sick or elderly relatives from being "pushed into death", one campaigner told Good Morning Britain.
Prue Leith, who lost her brother to bone cancer, said she was "not asking for euthanasia" but wanted to give the terminally ill the option of a peaceful death.
More top news
Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
Windy this weekend with gales across northwestern parts of the UK. Rain spreading southeast.
Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."