Hi @ZAP Welcome to the forums.
There are a number of support options available in Qld for carers however the government last year changed the way services were delivered. Due to forum guidelines we cannot recommend any specific group but this is general information that may be of help
Wellways was awarded the govt contract to provide free mental health carer support services in Qld.
https://www.wellways.org/understanding-mental-health/i-am-family-member-friend-or-carer
Carers Qld were not successful in their bid, but may still offer support groups.
https://carersqld.com.au/support-services/support-groups/
The BPD Foundation offers a free family connections class which may be helpful
https://www.bpdaustralia.org/about-family-connections/
You may also find this helpful
http://mhr4c.com.au/
The carer gateway is the govt carer portal and has helpful information
https://www.carergateway.gov.au