I wish there was more acceptance of suicide as an illness - just like cancer is an illness. Because it is in my opinion. 85% of suicides have mental illness and the brain is different in those who commit suicide. They've studied it - suicides have less white matter in (the hippocampus? I forget). So it's just in a sense like a parent dying of any other illness - if it's looked at in a more scientific fashion.
Blaming people for committing suicide, simply because they have an invisible and devastating illness is not scientific.
I think the kids would need to have a clear message that it is not their fault, that you love them, that you tried to stay for them. Maybe a letter/video message or two.
My ex's father hung himself and was discovered by his daughter. I'm sure you won't do that. Don't let them see you dead... Both children survived and lived. The daughter has terrible depression. The son -my ex- has issues - but is okay. His father's family blamed the mum, but no-one can stop that level of depression.
Saying all of that - have you tried microdosing with shrooms. I'm not saying it helped me, but they are saying it helps! Also Ketamine. Try everything first.
Also, look at Tramadol for treatment-resistant depression (if that is your issue). Check out the reviews on Drugs.com.