How to force “Keep expanded others” setting on child accordions with this function disabled on father accordion?

Hi There,

Is there any possible way to enable "Keep expanded others" functions on CHILD accordions while having this function disabled on FARTHER accordions? It doesn't work through plugin options.

I choose:

1) Child accordion - Accordion Options --> "Keep expanded others" = "YES" | 2)Farther accordion - Accordion Options --> "Keep expanded others" = "NO". And first item of child accordion inside father accordion fails to keep expanded, while clicked on next items of child accordion.

Probably, there's need for custom CSS to force "Keep expanded others" on CHILD accordions. Could you, please, provide custom CSS to fix this?

Thank you in advance!