Difficulties with advisor inattention during MSc I'm currently half-way through my graduate research program. I have two advisors, one that was supposed to be my main advisor (who
admitted me into the program) and a co-advisor. Over the past few months, I feel that my main advisor has all but abandoned my efforts.

We're supposed to have weekly meetings but the main advisor will
skip them every other week or so for various reasons. For instance, they skipped
meeting with me recently to continue to help another graduate student with making edits
for a final submission of a paper. I, however, had the same final submission deadline
and also needed assistance with making edits from reviewer comments.

Initially, I thought that the main advisor may have just been unusually busy for the year.
However, I learned that they will email the other two MSc students sometimes 3-4 times in a single
day with correspondence about ideas to try. That is, it seems that they are actively engaged in the other students' projects. Further, their meetings with the other 2 MSc students sometimes go for 3-4 hours or even late into the night.
Conversely, my meetings, if they take place, are ended at the hour.


The co-advisor still meets with me regularly but they have their own graduate students and so
I'm not sure that they prioritize my project. I feel this way because I almost always have to remind them what my project is about at the start of meetings.
I have some questions:

Should I communicate my concerns with them? If so, how do I communicate this without offending
them about their supervisory capabilities?
Maybe I'm being overly sensitive about being de-prioritized and this is a relatively
normal situation? Does that seem to be the case?

I would like to work on a PhD so I want to get the most I can from this degree.
don't say "they don't believe in my ability as a researcher", it's self loathe and may become a self-fulfilling prophecy. As a supervisor of msc and phds myself, I think research skills can be learned. Are they pointing you towards resources at the university, like training on research methods? Do you think you lack those? 

I add that weekly meetings are a luxury at my university, so maybe your supervision is working fine, and you may have just a bit of envy of the extra attention your peers receive? Or do you think your research is really suffering and struggling to progress?

I saw you've been thinking about possible reasons above, but I believe there are more explanations like (4), maybe the subject area of the other students is closer to what the supervisor does, so they have more to talk; (5) your area is more advanced than what they do so they don't know the methods and don't have much to contribute. I believe that you can talk to the main adviser openly about your concerns. You can directly ask them what they think about your research and where it's going. You can also ask about the frequency of the meetings. It will be a delicate conversation but it's better said and resolved than let accumulate. But the main question is, do you believe it's a good project? Is it interesting and innovative? Are you on top of the literature? 

And grab the opportunity of writing that a publication, obviously it's very good for your phd application but also can increase the interest and frequency of communications with the current advisers.