To not fall put with my grandma

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My grandma has left my grandad.

Biologically she isn't my grandma but they've been together since before I was born so she has always been my grandma, she still send us cards, keeps in touch etc, grandad doesn't, it's obvious grandma has always done this, not grandad.

My dad, who doesn't get in with her because she was the OW and grandad who's not takin the split well think I should now cut her out of my life because "she isn't really related to us"

But she is to me and my 4 children

Did your grandma and grandad have other children after your dad together? I think that's what you said. So you have aunties and /or uncles that are biologically your grandad and your grandmas? could they try and point out you're all still a family?

Could you agree to see your grandma without dh and dgd?

Definitely keep in contact. It sounds as though she's loved you and your children for a long time - I think it would be mean to cut her out of what has been her family for decades.

Your Dad and Grandad need to deal with their issues themselves. Don't flaunt it to them, but don't let them dictate who you, as an adult, have a relationship with.

I agree - keep on seeing her. A lovely relative who is interested in your life and a nice grandma to your children is worth a very great deal.