Help triple booting win10 and 2 Linux distros

[Macboi]

Hello people of the internet!

 

I recently got into DOS gaming through messing around with DOSbox and I am in some need of assistance with running FreeDOS in a triple boot configuration.  I have an old Acer laptop that has a Celeron M and 2 gigs of ram that is already dual booting windows 10 32bit (somehow it manages this) and Linux mint 32bit.  I'm not sure how I can also install FreeDOS with this and have it appear in GRUB as a boot option and also not how to mess it up and not have the option to pick booting into win10/mint.  GRUB really confuses me...

 

I am happy to answer any questions you have and thank you very much for any assistance you can provide.

[Electronics Wizardy]

make a partition for freedos, install there, then reinstall grub.