Mom or mom?

[billonbeach]

In writing prose, is the word 'Mom' (or the English 'Mum') capitalized mid sentence, or is the 'm' lower case.
eg. He went to ask his Mom if he could go out.

[Raymott]

In writing prose, is the word 'Mom' (or the English 'Mum') capitalized mid sentence, or is the 'm' lower case.
eg. He went to ask his Mom if he could go out.

Lower case, unless it's used as a name for Mum.