Advice Please

I am currently 4 months into a job, but recently, family health issues have caused me to consider moving back home. I am in a speciality area and there is an opening at a hospital near my home within the same system. I cannot transfer until 6 months, however, I feel that given the circumstances I would be given an exception, or would simply apply now and request that my start date be after the 6 month mark.

I am concerned because of understaffing in my current unit. My manager and colleagues continually stress the need to "keep" new people. If this is an avenue I plan to pursue I know that I need to make my manager aware of my intentions. I have absolutely no idea how to go about it.

1. I am afraid that my manager will be upset with me personally. The reason I want to transfer is very personal involving my family. I do not want to answer questions about it or feel forced to justify my plans with details of the situation. For this reason, I feel that my coworkers and manager might believe I am simply making excuses.

2. I am afraid that due to understaffing my manager might attempt to make a deal with the manager at the other hospital to keep me in place.

3. I am worried that I will tell my manager of my plans, not get the job, and then face resentment at work. I give 100% each time I show up for work. I do not want others to question my dedication to the unit/patients.

I have had no absences or mistakes at this point. I am well-liked and patients say good things about me. I want to go home and help support my family through a difficult time, but I am a generally passive person and am not sure how to go about this. I am hoping for some advice.