Multisite Sitemap – special case

Hi guys,

I’ve a very unusual case here. Or at least I think it’s not common.

We’ve 2 daughter companies. And one parent company.

So we have 3 multisites for all three. The URL strcuture is as follows:

http://www.parent.com/ for parent
http://www.parent.com/child1 for daughter enterprise 1
http://www.parent.com/child2 for daugther enterprise 2

now what we need is a global sitemap that I’ve to generate once for all multisites. Without generating 3 as usual with multisites (because I only have multisites because of different theme and link structure). But the sitemap must be only one.

Can your plugin do that for me somehow? Do you know a way?

https://ww.wp.xz.cn/plugins/bwp-google-xml-sitemaps/