How to allow access to a private group

Would someone please help me out to find a way to grant users access to a private group.

A user can have many private groups. Every private group may receive many join requests from other users. I need to find a way for group owner to allow individual requester to have access to the group he or she is applying for.
I have created a group of type Group and then a RG of type Group within which i have another RG of type User. This perfectly sets up each private group and its join sequesters.
But i do not know to allow them access.

Please see below.

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