My dad always referred to my mom as “your mother” . It drove my mom crazy. I call my MIL mom but my husband calls my mom by her first name. When we were kids we called close friends of our parents Aunt and Uncle out of respect.
Kids are a different breed. Both of mine are marching band kids, they refer to me initially as Mrs. Last name or, shudder, Mama Last name. All the band kids do it, I’m not sure if that was somewhere suggested to them or what. I don’t know why I hate the later. I just say call me First name. Hey if you’re going to be spending that kind of time around me I appreciate the respect but formality isn’t necessary.