In other words, capitalize words such as Mother, Father, Grandmother, Grandfather, Son, Daughter, and Sis when they are used in place of the person's name. Do not capitalize them when they follow possessive pronouns such as her, his, my, our, your.

Is Mom capitalized in your Mom?

Proper nouns are capitalized and common nouns aren't. In other words, when “Mom” and “Dad” are used in place of a person's name, they're capitalized. ... If the sentence works with the name inserted, capitalize “Mom” — just like you would if you were using her actual name.

Should Great grandma be capitalized?

What does great-grandmother mean? ... Great-grandmother should be capitalized when it's used as a proper name, as in Please tell Great-grandmother that I miss her. But great-grandmother does not need to be capitalized when it's simply used as a way to refer to her, as in Please tell my great-grandmother that I miss her.