According to the Australia Cemeteries Index, this is Cemetery Number 2806.
This is a small well-kept cemetery with 5 rows of full grave site with headstones followed by 11 rows of lawn plaques and then 2 rows of lawn headstones. There is also a cremation wall and garden.
The land was originally donated by the Brennan family and managed by trustees. The trustees handed over responsibility to the Beaudesert Shire Council in 1985, and subsequently to the Logan City Council upon amalgamation in 2008. The oldest headstone is that of Henry Thurlow, buried 29 Dec 1904.
When visiting council owned cemeteries, the signage has QR codes. By scanning one of these QR codes, you will have access to the deceased search directory. This directory will give you a walk to grave location in the cemetery like google maps with a location.
You are looking for S27 46.ABC E152 59.DEF
At the published coordinates
A= The date Agnes died - 28-4-6A.
B= The number of children listed on Agnes' headstone.
At WP2
C= Henry died Aged 8C years.
At WP3 the two side-by-side headstones have images. Select from the following:
1 Piano
2 Bicycle
3 Guitar
4 Tennis Racquet
5 Motor Vehicle
D= On Dani's headstone.
E= On Yvonne's headstone.
F= On either headstone, count the number of words on the next line following the birth-death dates.
Here is a Checksum (A+B+C+D+E+F): 18