"My grandmother is kind and affectionate" 可以用英语表达为 "My grandmother is gentle and loving"。

来源：
"gentle" 是英语中描述人性格温和、温顺的形容词，来源于古英语 "geontpce"，意思是 "of good birth"。
"loving" 是英语中描述人性格爱的、亲的的形容词，来源于古英语 "lufian"，意思是 "to have affection for"。

例句：

She is the most gentle and loving person I know.
她是我认识的最温和、最爱的人。
My grandmother always had a gentle and loving spirit.
我奶奶总是有着温和和爱的精神。
He is a gentle and loving father to his children.
他是一个对孩子们温和和爱的父亲。