A note on the NOAD about the usage of and reports that where a number of items are separated by and, the following verb needs to be in the singular. This means that the correct sentence is where are my mother and my father? The other sentence you wrote, as already reported in another answer, would be understood as where is "my mother and father"?, as if you would be referring to a single ...

Understanding the Context

grammatical number - "Where is" versus "where are" - English Language ... What is a contraction for where are? I wanted to ask "Where are the keys?" but want to use a contraction. Do I have to just say Where are, or can I say Where's and it's understood?

Key Insights

Is there a contraction for "where are" like "where's" for "where is"? Where are you? is asking where one is right now. Generally, it implies that the querent and the respondent are in different locations, and the querent wishes to know the respondent's present location. Where have you been?

Final Thoughts

is asking where one was at a recent time in the past, over an undefined period. It implies nothing about the current location of either the querent or the respondent. It does ... meaning - "Where are you" vs "Where have you been"? - English Language ... It's irrelevant to the question itself, but where in the hell are isn't a standard idiomatic usage.

By far the most common form is where the hell are, and a distant second is where in hell are. Using both prepositions in and the sounds decidedly odd to me. grammaticality - where are we vs where we are - English Language ... politeness - How to ask for someone's name and where they are from ...