Hi, Jason. I have no idea if we're related or not. Have you or any of your male Grant relations done a Y-DNA test. If you google FTDNA or Family Tree DNA you can check out the test, pricing,etc. They have an excellent and active Grant Project that has about 550 members. If you do the test, you have the option of joining the project. Besides finding out which of over 30 groups of Grant you belong to, there are ample members and administrators to help.
I hope this helps. Anita