Earlier quoted context omitted.
I am fairly sure English doesn't have (or at least does not use) separate everyday words for farmor/farfar (fathers mother / fathers mother) or mormor/morfar (same for mothers parents). Sure in academic language there is probably a way to describe it (edit: and the concept is easy to explain) but there is nothing quick that you can use to tell a kid so they immediately know which of the grandparents we are going to v…
English has "Paternal grandmother" and "Maternal grandmother" for example, it's just not often used and isn't turned into a compound word.
That is the distinction I tried to make above between academic and everyday language.