Mom or mom?

When we write, we write Mom or mom in the middle of a sentence? Same question about dad.

Thanks

In my opinion…

If “mom”, “dad”, etc. does not substitute for a person’s name then it does not need a capital:

“I’ll have to ask my mom.”
“His dad is sick.”

If it substitutes for a name then it should be capitalised:

“Hey, Mom, where’s my skateboard?”
“Hi, is Dad there?” (on the phone)