Capitalization rules can be confusing, but I’m going to concentrate on one thing here today: the capitalization of the words “mom” and “dad.”
Proper nouns are capitalized and common nouns are not. When "mom" and "dad" are used in place of a person's name, they are capitalized. When they're used to describe a generic parental relationship, they must be lowercase.Examples:
My mom took us to the park.
Dad was mad at me for making a mess, but my mom cleaned it up.
My brother told me that Mom and Dad said we were going on vacation.
My Mom took us to the park.
My Dad was mad at me for making a mess, but my Mom cleaned it up.
My brother told me that mom and dad said we were going on vacation.
If you’re ever unsure, you can google the rules. I spoke to an author once who told me she asked about this in a group of writers and was told it was ok to capitalize “mom” and “dad” any time. Not true. Writers are not always editors. You’re better off using Google.