I hope that you didn't think that I was being critical of your ideas. I think they are both very interesting and have great potential if you can focus your research/questions related to the issues. A plus is that there are several potential overlaps between the 2 subjects.
I agree with you that it seems families need to be offered strategies and support to transition into more healthy and peaceful family/relationship settings. Beyond Christina Aguilera, have you identified a great need for these types of interventions? Are there loca organizations of service providers, organizers or victim groups who have verbalized this need? I don't doubt that there is a need and I understand that we are in the beginning stages, but you'll need to quantify this. Perhaps if when you make your initial contact with a group/organization you'll find others. Start local. Your work will be more relevant and more easily manageable this way.
In these first few contacts, you'll also find some interesting choices you'll come across for various directions you could go with this project. It could be the perfect combination of passion+theory that makes a solid thesis.