Sounds daft, but print a copy of this thread off, and show people at your school, see what they say, then take it in to the CFI, see his/her reaction and explain your situation. Screw the effect it has on your instructor! Your money is currently being wasted. Special offer!! I can cut your costs in half!!!!! Give me the money, stop flying, I'll give you half back. Now
that sounds really daft right? Well it's a better situation for us both, so get your @rse in gear, use the enthusiasm that's still in there somewhere and tell your instructor to stick it where your money won't go.
Sorry if that sounds harsh and unfeeling, I know you're in a tough spot, but unless you act quickly, your confidence will reduce, you will give up, and that's another family member gone. Change instructor, keep posting, let us know how you get on, and get yourself to a fly-in!