Translation:a kind grandmother and a kind grandfather
La6iif means "gentle," not "kind." 6ayyib طيّب is the word for "kind."
Can this mean "a grandmother is kind and a grandfather is kind"?
I think that would be الجَدّة لَطيفة وَالجَدّ لَطيف
That is a correct Arabic sentence, but it means "The grandmother is kind and the grandfather is kind." :)
Nope, you'd need to say something like "There is a kind grandmother and a kind grandfather." هناك جدة لطيفة وجد لطيف.